What is his punishment gonna be when he eventually fails a piss test?
All depends just how sloppy, drunk, and rude he is in court. For a first piss test failure, total revocation of probation and the imposition of the underlying sentence is not usually the first resort. No, they'll start by scolding him harshly and putting stricter conditions on him; for instance, if he fails a test, he might be required to wear a GPS tether or an ankle bracelet that tests for the presence of alcohol in his blood in real-time:
It's when Nick then fails
again, under these new, harsh conditions, that the real punishment will begin. The court will rule that Nick is a danger to himself and others because all non-carceral methods of preventing his drinking and drug abuse have failed. Accordingly, the court will then throw him in jail for 30 days on contempt, although they'll probably waive the 30 days' jail if he apologizes really hard and manages to appear non-drunken in court. After all, even murderers can get their contempt charges forgiven, as long as they "apologize":
Nick will then be released after 30 days and will fuck up
again. This time, he gets 60 days, and the judge warns him that the underlying sentence
will be imposed if these antics continue.
Well, what do you think happens when Nick is released after spending another 60 days in the clink for contempt? That's right ... he'll snort cocaine and shit-flakes off a femboy's unwashed hairy asshole!
And that's when the underlying sentence of 7 years' incarceration will be imposed and Nick will do hard time.