There’s an idiom in the security business that if professionals are spying on you, you’ll never know. I’m not sure I agree with that fully. I believe we all have that hard wired alarm in our head that lets us know when things aren’t quite right. If you do get that, ask yourself “Am I worth spying on?” Some of the reasons someone might be watching you are divorce or a bad breakup, a company sale or merger, or if you are suspected of being involved in criminal behavior. And then you have the people that just like to watch.
Being secure means being aware. Watch people, vehicles, patterns. If you’re driving, randomly park and watch for the same cars recurring. Same with people, if you’re walking take an unexpected turn and watch how people react. I can not express strongly enough to never ever let a person or persons approach you rapidly from behind.
If you suspect you are being followed/stalked/spied on contact your local police department at your earliest opportunity. They will rate the possibility you are being spied on by metrics such as are you in a profession or situation where surveillance is seen more. (this is the formula: Likelihood x Consequence × Vulnerability = Risk.Do not become flustered if they appear to not believe you! Stay calm and just state facts, no conjecturing.
Finding a wire/bug/transmitter is usually a tedious, methodical process. The first and only option you likely have is a physical search. Did someone recently give you something? Have you checked all areas all others have had access to? The first area a casual acquaintance will likely place a bug is under a shelf. Look for places they would have access to to retrieve something as well. Also, listen when you enter a room. Cameras are often set to motion detection, and you will hear a soft click and whir sometimes. Also, you may notice radio frequency interference in radios or televisions. If you do find one don’t touch it – have a police officer document it. I would not be able to do anything but point at it myself, as it is not my property and I could be sued.
Stay safe over the holidays everyone!