I remember hearing about police thermal camera use being unconstitutional (or at least not allowed) in some places. How is this different?

I would like to add I have no source for this it’s just something I remember hearing and you shouldn’t believe people on the Internet do some research in verified sources or reputable news organizations and definitely don’t just blindly believe what I have to say, but if it’s for entertainment purposes then sure believe me. I believe me but I’m not heavily invested in verifying this fact.