When you suspect your spouse of infidelity, the urge to take immediate action is overwhelming. However, acting on emotion rather than strategy can compromise your ability to gather usable evidence—and potentially expose you to legal liability.
This guide outlines seven completely legal methods to investigate infidelity within your own home. These techniques provide preliminary intelligence that either confirms your suspicions (indicating you should hire a professional) or provides peace of mind.
Critical Legal Warning
Many "DIY" investigation methods promoted online are illegal. Wiretapping, hacking email accounts, installing keyloggers, or placing GPS trackers on vehicles you don't own can result in criminal charges and make any evidence you gather inadmissible in court. This guide covers only legal methods.
1. Check Shared Computers and Tablets
Devices you own jointly or that are used in shared family spaces are fair game for investigation. Here's what to look for:
Browser History
- Dating sites: Look for visits to Tinder, Ashley Madison, Bumble, or Match.com
- Incognito mode gaps: Frequent use of private browsing during odd hours
- Deleted history: Empty history when other days are populated suggests deliberate clearing
- Email logins: Check for secondary email accounts you weren't aware of
Downloaded Files
Check the Downloads folder for:
- Photos of unknown people
- Dating app installation files
- Hotel receipts or travel documents
- Deleted items in the Recycle Bin/Trash
Pro Tip
Take screenshots of anything suspicious with timestamps visible. This creates a contemporaneous record of your discovery.
2. Analyze Phone Bills and Records
If you share a phone plan, you have legal access to call logs and billing records. Look for these patterns:
Call Patterns
- Repeated numbers: Frequent calls to the same unknown number, especially late at night or during "work" hours
- Duration anomalies: Long calls during times they claimed to be busy or in meetings
- Text message volume: Unusual spikes in texting to specific numbers
Data Usage Patterns
High data usage during times they claimed to be sleeping or working suggests active phone use they're hiding.
Cloud Storage Billing
Check for charges from iCloud, Google Drive, or Dropbox. Hidden photos and documents are often stored in secondary cloud accounts.
3. Monitor Shared Financial Accounts
Financial infidelity often accompanies physical infidelity. Review:
Credit Card Statements
- Restaurant charges for two when they claimed to be eating alone
- Hotel charges, especially local hotels
- Gas station purchases in areas they had no reason to visit
- Gift purchases you never received
- Charges from dating apps or "massage" services
Bank Statements
- Unusual cash withdrawals (affairs often require cash)
- Transfers to unknown accounts
- ATM withdrawals in suspicious locations
- New credit cards you weren't told about
Case Example
One client discovered a $400 charge at a local boutique hotel on a night her husband claimed to be working late. The timestamp matched a "working" text he sent her. This single charge provided the probable cause needed for a full investigation.
4. Document Behavioral Changes
While not direct evidence, behavioral changes create a pattern that supports other evidence. Keep a journal of:
Schedule Changes
- New "work projects" requiring late nights or weekends
- Sudden gym membership or fitness obsession
- Unexplained errands that take hours
- Frequent "business trips" with vague details
Technology Habits
- Phone suddenly password-protected (when it wasn't before)
- Phone kept face-down or taken to bathroom
- Immediate deletion of all text messages
- New email accounts or social media profiles
- Second phone "for work"
Appearance Changes
- New wardrobe, especially underwear or grooming products
- Sudden weight loss or fitness regimen
- New cologne/perfume you didn't buy them
- Showering immediately upon coming home
Documentation Tip
Keep a dated log of these observations. In court, a contemporaneous journal carries more weight than memory alone.
5. Check Location History (If Shared)
If you share Google or Apple family accounts, you may have access to location history:
Google Timeline
If your spouse uses Google Maps and location history is enabled, you can view their movements at google.com/maps/timeline. Look for:
- Visits to residential addresses you don't recognize
- Time spent at hotels or motels
- Locations that contradict their stated whereabouts
Apple Find My
If you share Apple Family Sharing, you can see device locations. Check for:
- Devices left at unusual locations
- Location history in Find My app
Important
Only access location data you have legitimate access to through shared accounts. Hacking into their private accounts to get this information is illegal.
6. Social Media Monitoring
Public social media activity is legally observable. Look for:
Facebook Activity Log
If you have shared device access, check their Activity Log for:
- Check-ins at restaurants or locations they didn't mention
- New friends, especially of the opposite sex
- Comments or likes on suspicious profiles
- Messenger activity (if logged in on shared device)
- New followers or following lists
- Comments on their posts from unknown accounts
- Tagged photos they haven't shown you
- Story activity during times they claimed to be busy
Reverse Image Search
If you find suspicious photos, use Google Images reverse search to see if they appear on dating profiles or social media under different names.
7. Home Security Cameras
Installing security cameras in your own home is generally legal, with important caveats:
Legal Placement
- Legal: Common areas (living room, kitchen, entryway, driveway)
- Illegal: Bedrooms, bathrooms, or anywhere there's an expectation of privacy
- Gray area: Home office (consult local laws)
What to Look For
- Visitors when you're not home
- Unusual comings and goings
- Phone conversations in common areas (if audio is legal in your state)
- Behavior when they think they're alone
Audio Recording Laws
Eleven states require two-party consent for audio recording (California, Florida, Illinois, etc.). In these states, disable audio on security cameras or you risk felony charges. Video-only is generally safer legally.
When to Hire a Professional PI
If your preliminary investigation confirms suspicions, it's time to hire a professional. Here's why:
Legal Compliance
Professional investigators know exactly where legal boundaries lie. Evidence they gather is admissible in court; DIY evidence often isn't.
Objectivity
Emotional involvement clouds judgment. A professional provides objective facts, not interpretations.
Resources
PIs have access to databases, surveillance equipment, and techniques unavailable to the public.
Safety
Confronting a cheating spouse without solid evidence can be dangerous. PIs provide the proof you need before any confrontation.
Ready for Professional Help?
Our infidelity investigators provide court-admissible evidence within 72 hours. Confidential consultation available 24/7.
Learn About Our ServicesWhat NOT to Do (Illegal Methods)
To protect yourself legally, avoid these common but illegal "investigation" methods:
Wiretapping
Recording phone calls without consent (in two-party states) is a felony.
Hacking
Accessing email, social media, or phones without permission violates federal computer fraud laws.
GPS Tracking
Placing GPS trackers on vehicles you don't own is illegal in most jurisdictions.
Keyloggers
Software that records keystrokes violates wiretapping and computer fraud laws.
Impersonation
Creating fake profiles to catfish your spouse can constitute fraud or harassment.
Trespassing
Entering a paramour's home or workplace is burglary, regardless of your marital status.
Evidence obtained illegally is inadmissible in court and can expose you to criminal prosecution. It's never worth the risk.