Without ever confirming that he or she is under surveillance, or even denying it? Pointing him or her out to security guards and others etc, for months, years or decades, so that the individual is constantly tormented by not knowing whether the surveillance is real or the product of paranoia?
I am thinking of writing a script for a movie with this type of scenario in mind. Just wondering if it could happen at all from a legal point of view.
Presumably it happens all the time pretty much everywhere to some extent - violent or thieving drug addicts and hobos are constantly pointed out to local security even if many have clear mental health problems, but what about on a much bigger scale to somebody already known by law enforcement to be suffering from paranoia? At what point does it become deliberate gaslighting? And even then would it be illegal?