I found this: > My understanding of the rule that has emerged from prior decisions is that there is a twofold requirement, first that a person have exhibited a

I found this: > My understanding of the rule that has emerged from prior decisions is that there is a twofold requirement, first that a person have exhibited an actual (subjective) expectation of privacy and, second, that the expectation be one that society is prepared to recognize as "reasonable." [0]: https://en.wikipedia.org/wiki/Katz_v._United_States https://en.wikipedia.org/wiki/Katz_v._United_States