This is not normal/acceptable in the US. I remember when parallel construction was thought of as a horrible/unacceptable violation of the Constitution in the US. Now the 'Constitution' party doesn't give AF and loves it. It's crazy how far we let slippery slopes take us. All because of convenience or 'it's not that big of a deal yet'.

Separate evidence for ...?

evidence of crime separate than what is obtained via compulsion of circumstances.

What do you need the evidence for, I mean?

Criminal prosecution