Only in limited circumstances. The strongest legal defense is to attack the procedures and legal bullet points in the process. Didn't get that form proving chai

Only in limited circumstances. The strongest legal defense is to attack the procedures and legal bullet points in the process. Didn't get that form proving chain of custody between these two parts? Oh, too bad, out the window that evidence goes. It might be possible to harass someone without warrants and paperwork, but securing a conviction at least for the moment still requires evidence gathered according to the law, or parallel construction to obscure the origin of the evidence.