Comment by ColoursofOSINT

"You can't base law on a sliding scale like entropy."

I would disagree. Courts decide on the sliding scale. I am no lawyer, but in Canada and the USA you have a "A Reasonable Expectation of Privacy" [1].

For example, see thermal imaging use by police[2].

[1]: https://www.cwilson.com/a-reasonable-expectation-of-privacy/

[2]:https://en.wikipedia.org/wiki/Kyllo_v._United_States