You won't if the subject turns out to have been involved in criminal activity. That's RAS ex post facto and the courts will invariably let it slide.

That's not what we are discussing (well I am at least). If you do an NCIC check on a completely innocent individual that's between you and your victim; it will never get anywhere near a court. A complaint against you or your PD will be dismissed out of hand.

You have free rein if you want to avail yourself of it, which apparently you do. Still not right but what ya gonna do ?