Counter-Surveillance for Ordinary People: How to Tell If You Are Being Watched

The techniques used to watch people are no longer specialist. Tracking hardware costs less than dinner, monitoring software installs in ninety seconds, and both are routinely used in domestic situations. Here is what detection actually involves.

Digital First

The overwhelming majority of unauthorised monitoring is digital, because it is easy and requires only brief physical access to a device. Signs include battery drain that started abruptly, unexplained data usage, a device running warm when idle, and settings that revert after you change them.

The practical response: audit which accounts have access to your location sharing and cloud backups, review authorised devices on every major account, check for accessibility services and device-administrator apps you did not install, change passwords from a device you are confident is clean, and enable two-factor authentication on email first — email is the master key to everything else.

Vehicle Trackers

Consumer GPS trackers are magnetic, roughly the size of a deck of cards, and typically placed inside a rear wheel arch, under a bumper, in the boot beneath the spare, or plugged into the OBD-II port under the dashboard. That last one is worth checking first: it takes three seconds to install and most drivers have never looked at the port.

Physical Surveillance

Genuine physical surveillance by professionals is difficult to detect and, for private individuals, comparatively rare. The amateur version is not. Indicators: the same vehicle at different points of your routine, someone who consistently knows where you have been, or a person appearing at locations that are not on any published schedule. Note plates, times and locations in writing rather than relying on memory — a pattern documented over a week is worth far more than a strong impression.

Do Not Confront

Discovering a tracker or stalkerware is evidence. Removing or deleting it immediately destroys that evidence and warns the person responsible. Photograph it where it sits, note the date and time, and take advice before touching anything — particularly if the matter may become a criminal complaint or feature in family proceedings.

When It Is Domestic

If monitoring is coming from a current or former partner, this is not a technical problem with a technical solution. Contact a domestic abuse service before changing anything, because the period immediately after a controlling person loses access is statistically the most dangerous. Specialist advisers understand the sequencing far better than any security guide.

Professional Sweeps

Technical surveillance countermeasures — proper TSCM — use spectrum analysis, non-linear junction detection and thermal imaging to find devices that consumer detector apps cannot. For boardrooms, executive residences and high-conflict domestic matters, it is worth the cost. For most people, the digital audit above resolves the question.

About the author

Dan Ribacoff is a licensed private investigator and the founder of International Investigative Group, a certified polygraph examiner, certified firearms instructor, GIA Graduate Gemologist and the author of I, Spy: How to Be Your Own Private Investigator. He works from offices in New York, Boca Raton and London, and has appeared as a polygraph expert on American and British television.