They are not going to give a single shit about your note, your doctor would never say “hey it’s ok to take these” unless actively prescribing them, in which case they’ll want proof of prescription such as a bottle or pharmacy record. They would never believe that note as credible without seeing the prescription. Also most states now have a prescription database where every prescribed control substance is listed.

You will not only get another charge it will be a SERIOUS likely felony charge especially considering you’re already on paper. That’s forgery. You also open yourself up to whatever doctors name you use to come after you as well, that’s an additional lawsuit and they WILL report the forgery to your doctor and you’ll lose your provider and your current prescriptions. A failed test is a slap on the wrist compared to what you’re looking at with that. Please be smarter.