What should you do first if you find evidence of cheating? - How to save evidence without deleting it and points to note -
🦉 FILE-005
"I found it."
An intimate LINE message displayed on your partner's smartphone.
A hotel reservation screen.
A photo you don't recognize.
At that moment, your mind goes blank,
"I want to confront them right now"
is something many people have thought.
You want them to explain what is going on in their own words.
If they are cheating, you want them to admit it right now.
It is very natural to feel that way.
However, when Investigator Ho checked public information from detective agencies and law firms, as well as actual personal experiences,
the actions taken immediately after finding evidence determine your subsequent options
was a common point that emerged.
As a result of confronting them in the heat of the moment after finding evidence, the LINE messages were deleted.
The other party became cautious and started hiding their smartphone and actions.
Conversely, by suppressing emotions and saving the information, it became easier to explain the situation during subsequent consultations and discussions.
This time, we will organize what you should do first when you find something that looks like evidence of cheating.
Before acting in a rush, first protect the evidence and your own options.
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🦉 Investigator Ho's Conclusion
When you find evidence of an affair, your top priority is,
not to confront them, but to save it in a way that it cannot be deleted.
Organize the saved information along with the date, time, and the situation in which it was discovered.
After that, confirm whether you are considering reconciliation, divorce, or claiming compensation for damages,
and consult with a professional if necessary.
What you will learn in this article
Why you should not confront them immediately even if you find evidence
Key points for saving LINE messages and photos
How to organize and store evidence
Actions to avoid after discovering evidence
Who you can consult after saving the evidence
Points to compare before consulting a private investigator
🦉 This investigation memo
In this article, we have cross-checked the following publicly available information.
Public columns from detective agencies
Explanations from law firms and legal media
Public information regarding the law
Personal experiences from Yahoo! Chiebukuro and personal blogs
Rather than treating one specific piece of information as the absolute truth, we have organized the content based on
what was common across multiple sources.
Please note that how information is obtained and evaluated as evidence varies depending on individual circumstances. If a legal judgment is required, please consult with a lawyer.
1. Even if you find evidence, do not confront them immediately
The moment you find something that looks like evidence,
"What is the meaning of this?"
"Who is this person?"
"You're cheating, aren't you?"
It is natural to want to ask these questions.
However, please think for a moment before confronting them.
Is the information you currently have in a state where you can explain the facts even if the other party denies it?
If you confront them when you only have one piece of evidence,
it does not necessarily mean the other party will admit to the cheating.
"They are just a friend."
"It's a work-related message."
"You are misunderstanding."
There is a possibility that they will deny it.
Furthermore, once the other party realizes they are being suspected, they may:
Delete LINE messages or photos
Change their smartphone passcode
Get their story straight with the person they are cheating with
Change where they meet or how they communicate
Become more cautious in their actions
You might also consider taking such measures.
Even if you wish to reconcile the relationship, if you start talking while your emotions are in great turmoil, it may turn into a blame game rather than a confirmation of facts.
💬 What was seen in personal experiences
In personal experiences on Yahoo! Chiebukuro and other sites,
I confronted them in the heat of the moment after finding evidence, and they deleted their LINE messages that same day
were the kinds of stories seen.
Additionally,
I wanted to talk about the cheating, but I was blamed for looking at their smartphone, and the conversation was diverted
were also regrets mentioned.
On the other hand, from those who saved the information first and organized what they wanted to ask before discussing it,
Even when they denied it, I was able to calmly convey the facts I had confirmed
were the voices heard.
🦉 Investigator Ho's findings
In the public information from detective agencies and legal sources checked this time,
Do not confront them based on emotion before securing evidence
was introduced as a common point.
Confronting them is not bad in itself.
What tends to become a problem is confronting them before saving or preparing.
② Save evidence before it disappears
LINE messages and photos remaining on a smartphone can be deleted in a few seconds.
If you think, "I'll take a picture later when I'm calm,"
there is a possibility that you will no longer be able to check it by then.
If you find something that looks like evidence, first consider saving it in a way that shows the situation.
When saving, it is important not to just save a part of the content, but to ensure that
the date and time
the other party's name
the context of the conversation
which device's screen it is
the situation when it was discovered
are all clear.
For example, there is a method of using another smartphone or camera to photograph the device itself along with the screen.
For important exchanges, recording a video of yourself scrolling through the conversation makes it easier to explain the flow of the conversation.
Screenshots are also easy, but it can be difficult to understand the context of the conversation with just a part of it.
It is safer not to rely on just one method, but to combine photos, videos, and backups.
💬 Common points in public information
In public columns by detective agencies, it was introduced that you should save not only screenshots but also
in a way that shows the entire screen and the flow of the conversation
. Rather than cutting out just one image, it is easier to explain the situation later if you keep records of when the exchange took place,
who the conversation was with,
and the flow in which the statements were made.
🦉 Investigator Ho's Investigation Results
What was common across multiple pieces of public information was
not to rely on just one saving method, but to keep it in multiple forms
was the key.
The basic approach is
Capture the entire screen in a photo
+
Record the flow of the conversation in a video
+
Back it up to a separate location
This is the combination.
However, acts such as logging into the other party's account without permission or illegally bypassing passwords may lead to other legal issues.
Please avoid forced operations.
3. Organize and store the saved evidence
Just saving photos and videos may lead to
later
"When was this taken?"
"How did you find this?"
becoming unclear.
Information that appears to be evidence should be organized at the same time it is saved.
The items you should record are as follows.
Date of discovery
Actual date of the message or photo
The other party's name or account
Context of the conversation
Which device it was found on
The situation when it was discovered
Related receipts or activity logs
For example, it becomes easier to organize if you name the files as follows.
2026-07-10_LINE_PartnerName
2026-07-12_HotelReceipt
2026-07-12_ReturnTimeMemo
By organizing files in chronological order and grouping events from the same day, it becomes easier to confirm the connection between actions.
Even when backing up to multiple storage locations, make sure to keep the folder and file names consistent.
💬 What was seen in personal accountsIn some personal accounts, people regretted saving many screenshots but losing track of when the events occurred.
Even if you save a large number of images, if you do not know the date, time, or circumstances, you will have to explain everything from scratch when consulting someone later.
It is important to record not only the evidence itself but also
“when, where, and how you found it”
as well.
🦉 Investigator Ho's Investigation Results
Articles supervised by lawyers and personal accounts mentioned that
by organizing evidence chronologically,
it becomes easier to explain the situation when consulting with an expert.
Saving is not the goal.
Organizing it in a way that a third party can understand later is part of
evidence preservation.
🦉 When you are not sure if the current evidence is sufficient
“I saved the LINE messages, but is this enough?”
“I don't know if additional investigation is necessary.”
“Is it okay for me to investigate further on my own?”
At this stage, there is no need to sign a contract with a detective agency immediately.
Convey the information you currently have, and
what level of information you have gathered
whether you are at a stage where additional investigation is needed
what kind of costs would be expected if you were to investigate
There is also a way to make a decision after consulting.
A free consultation is not just for deciding whether to hire someone,
but can also be used as time to organize your current situation.
For those who want to compare multiple companies first
▶ Compare for free at Machikado Consultation Office
*Using a free consultation does not mean you have to sign a contract on the spot. Check the explanation, costs, and investigation details, and if necessary, take the information home to consider it.
4. Five actions to avoid after finding evidence
If you panic and take the following actions after finding something that looks like evidence, the situation may worsen.
1. Confronting them on the spot
The other party may become cautious and delete LINE messages or photos.
Prioritize saving and organizing the information first.
2. Forcibly continuing to operate the other party's smartphone
Unauthorized unlocking of passwords or logging into accounts without permission can lead to legal issues.
3. Posting on social media
If the other party or mutual acquaintances find out, they may delete the evidence or realize you are investigating them.
Posting real names or personal information can also lead to separate troubles regarding honor and privacy.
4. Spreading information to family or friends while emotional
Consulting with someone is not a bad thing in itself.
However, information may be passed on to the other party by mutual friends or family members.
Also, even if you choose to reconcile later, those around you may remain unable to forgive the other party.
5. Leaving evidence unorganized
If you lose track of the dates and circumstances of the photos or videos you saved, it will be difficult to explain them during a consultation.
Organize them as soon as you find them.
This article also explains this in more detail.
▶ FILE-003 | 5 things you should not do immediately when you suspect an affair5 things
💬 Common points in public information
Public information from detective agencies also introduced cases where
the person had already confronted their partner, and the partner came for a consultation while on guard
about it.
If the partner knows they are suspected, they may change how they meet or communicate,
which can make subsequent investigations difficult.
🦉 Investigator Ho's findings
What stood out in the published failure stories was
regret not for finding the evidence, but for acting in a panic immediately after finding it
.
Not doing something right now does not mean you are doing nothing.
It is preparation to protect your evidence and your options.
5. After saving, do not carry the burden alone
After saving the evidence, what you should do next depends on the person.
You want to confirm only the facts.
You want them to stop the affair and repair the relationship.
You are also considering separation or divorce.
You want to claim compensation.
The evidence needed and who you should consult will change depending on the result you are aiming for.
If you wish to repair the relationship
If you want to repair the relationship, your goal is not just to keep collecting evidence.
You also need to think about what kind of discussion you will have in the future and what you want to confirm with your partner.
There is also the option of consulting a third party who supports relationship repair, such as a marriage counselor.
If you are considering divorce or claiming alimony
If you are considering divorce or claiming alimony, it is reassuring to check with a lawyer about how the current evidence will be evaluated.
Just because you have LINE messages or receipts does not necessarily mean they are legally sufficient.
Conversely, information that is weak on its own may have significance when combined with other materials.
If you are considering additional investigation
If there is a limit to the information you can collect yourself, you have the option of consulting a private investigator.
When consulting, having saved materials and a chronological memo will make it easier to explain the situation.
💬 Common points in public information
Articles supervised by lawyers introduced that the necessary preparations and procedures differ depending on whether you are considering divorce or hoping to repair the relationship.
Therefore, after finding evidence, it is important to gradually organize
"If it is an affair, what do I want to do?".
You do not need to give an answer right away.
Talking to a professional can sometimes help you organize your feelings and options.
🔮 When you want to organize feelings you cannot tell anyone
"I don't know yet if it's worth consulting a private investigator or lawyer."
"Before confirming the facts, I first want someone to listen to these painful feelings."
Some people may feel that way.
Immediately after suspecting an affair,
Is it really an affair?
Should I continue the relationship?
What do I want to do?
You may find yourself unable to answer even for yourself.
In such cases, you can also use fortune-telling not to confirm the facts, but as a way to find the words for your own feelings.
With Coconala's telephone fortune-telling, you can compare and choose a fortune-teller you can consult with by phone about love and human relationships.
▶ Find a consultant on Coconala Telephone Fortune-Telling
※Fortune-telling cannot confirm the facts of cheating or provide legal evidence. If an investigation is necessary, please consult a detective; if legal judgment regarding divorce or alimony is required, please consult a lawyer.
🦉 Investigator Ho's Investigation Results
Based on the public information confirmed this time,
not carrying the burden alone and consulting with the right person for your purpose makes it easier to organize your subsequent options
was a common point.
However, detectives and lawyers have different roles.
Detective: Fact-checking, investigation, and creation of evidentiary documents
Lawyer: Legal evaluation of evidence, consultation on divorce/alimony claims, etc.
Choose who to consult based on what you need right now.
Checklist for saving evidence when you find it
□ Did not confront them on the spot
□ Saved it in a way that shows the date and time
□ Also confirmed the other party's name and profile
□ Kept it in a way that shows the context of the conversation
□ Took photos including the device itself
□ Kept not only photos but also videos if necessary
□ Backed it up to a separate location
□ Made a note of how it was discovered
□ Organized it in chronological order
□ Did not use methods that could be illegal, such as unauthorized login
□ Did not publish it on SNS or to the general public
□ Prepared to consult a professional if necessary
❓FAQ
Q. If I find LINE messages, is a screenshot enough?
Screenshots are one way to save evidence, but it can sometimes be difficult to tell the context of the conversation or who owns the device.
If possible, use another smartphone or camera to take a picture of the device and the screen together, and record the flow of the conversation in a video to make it easier to explain the situation.
Q. Should I not confirm it with the person immediately after finding evidence?
It is not necessarily the case that you must not talk to them.
However, if you confront them before saving the evidence, there is a possibility that they will delete LINE messages or photos, or change their behavior.
First, finish saving and organizing the evidence, and think about what you want to confirm before having a discussion.
Q. Does looking at the other person's smartphone without permission count as evidence?
How the obtained information is evaluated as evidence depends on the method of acquisition and individual circumstances.
Unauthorized logins or unauthorized unlocking of passwords can lead to legal issues.
If you are unsure, do not perform any additional operations and consult a lawyer.
Q. Is it okay to send the evidence to a friend for advice?
Choose who you consult with carefully.
There is a possibility that it could be passed on to your partner by a mutual friend, or that personal information could spread.
Instead of sharing the evidence itself widely, you can also consult with a professional who has a duty of confidentiality.
Q. Can I consult a detective even if I only have one piece of evidence?
Yes, you can.
You can also use the consultation to check whether it is necessary to conduct an investigation with the information you currently have, what additional information is needed, and how much it will cost.
Just because you consult with them does not mean you have to sign a contract on the spot.
🦉 Investigator Ho's Investigation Results Report
What I found this time by comparing public information from detective agencies and law firms with actual experiences was that
the moment you find evidence is when you need to be the most calm
.
The flow that was common across multiple sources is as follows:
1. Save the evidence
↓
2. Organize the date, time, and circumstances
↓
3. Do not confront them while emotional
↓
4. Think about what you want to do
↓
5. Consult a professional if necessary
The more you act in haste, the more likely you are to lose evidence and options.
Conversely, by calmly documenting the facts and organizing them chronologically,
repairing the relationship
proceeding with fact-finding
considering divorce
consulting about claiming alimony
no matter which path you choose, it will be easier to make the next decision.
The first thing to do when you find evidence is,
not to demand an answer, but to preserve the facts.
That is the conclusion that has emerged from this investigation.
🦉 Investigator Ho's initial action advice
"I don't know if the evidence I have now is enough"
"Is it okay to keep investigating on my own?"
"I can't judge if the situation is serious enough to consult a detective"
In such cases, there is also the option of organizing the information you have and then seeking a third-party opinion.
Just because you use a free consultation does not mean you have to sign a contract on the spot.
You can ask about the consultation details, costs, and investigation methods, take them home to think about, or compare them with other consultation services.
For those who want to compare multiple companies first
▶ Machikado Consultation Office
For those who want to compare multiple detectives first
Recommended for those who want to find a consultant that suits them while comparing proposals and cost estimates from multiple companies.
▶ Haraichi Detective Agency
For those who want to consult directly with a major agency with a proven track record
For those who want to consult early, with nationwide support and 24-hour free telephone consultation.
▶ HAL Detective Agency
For those who want to proceed while discussing costs and investigation details
It is easy to start with a free consultation, and you can consider investigation plans according to your situation.
▶ ALGDetective Agency
For those who want to look ahead to legal consultation after the investigation
Operated by a lawyer corporation group, it is suitable for those who want to keep in mind future compensation claims and divorce consultations after the investigation.
*Using a free consultation does not mean you are obligated to sign a contract.
Before signing a contract, be sure to check the following points as well.
Investigation details
Breakdown of the estimate
Conditions for additional charges
Contents of the investigation report
Cancellation conditions
Whether you are satisfied with the explanation and response
It is also important not to decide on one company from the start, but to compare explanations and estimates from multiple companies before making a decision.
*The services listed are introduced as comparison targets based on publicly available information and service details.
📁 Related investigation files
Previous investigation
▶ FILE-004｜What counts as evidence of an affair and what does not
―LINE alone isn't enough? We investigated the strength of evidence―
Recommended reading
▶ FILE-003｜5 things you should not do immediately when you suspect an affair5 things
Next investigation
▶ FILE-006｜When is the right time to confront someone about an affair?
―We investigated why confirming too early leads to failure―
📚 Subject of this investigation
In this article, we have organized content that was common across multiple sources, including public columns from detective agencies, explanations from law firms and legal media, publicly available legal information, and personal experiences from sites like Yahoo! Chiebukuro and personal blogs.
Investigation date: August 1, 2026
Last updated: August 1, 2026
Note: Investigator Ho is not a detective or a lawyer. This article is intended to organize general information and does not provide individual legal judgments.