Yes and no. It's inadmissable in court, but that data can be legally used as tips, leads and to inform an investigation for more legal data collection avenues:

Yes and no. It's inadmissable in court, but that data can be legally used as tips, leads and to inform an investigation for more legal data collection avenues: it's called Parallel Construction: https://en.wikipedia.org/wiki/Parallel_construction https://en.wikipedia.org/wiki/Parallel_construction An example would be a police tip phone-number: it's all hearsay (unless it's a confession) and largely cannot be admitted into court directly, but it definitely leads to collecting solid evidence later on by investigators who can get warrants.