Have you any evidence that it doesn't happen. You appear to think that what I say couldn't be true. Have you any evidence it isn't?
The Key Forensic tester didn't mind making his statement in Court, when questioned.
Fact. There is no standard test.
Fact. Test houses can test in any way they wish as long as they follow their own procedure.
Fact. The Forensic Science Regulator is happy for test houses to use their own test procedure. If a Court accepts the "findings" however arrived at then that's good enough.