I would have thought the lie and get discharged for drugs option would scupper your future career prospects.
Yes, it will.
OP, you state that you have a job "lined up", but is that a firm offer? It's usually impossible to get a firm offer without them knowing for sure when you're available, which of course you don't know yet.
Then you have to bear in mind that if it's not a firm offer, more of a "could you have a look at this job and get back to us if it interests you" kind of offer, then you'll have at least an interview looming at some point.
The first question any new employer will ask is "why are you leaving your current job?" and if your answer involves drugs, even if it was purely to circumvent the PVR system, the rest of the interview is academic.
Your PSF and your boss are the people you need to be talking to, they're the only ones who can start to sway things and the advice will be more up to date and relevant than any you'll get here.