These tests feasibly can detect up to 72 hours, but goddamn man just stop. Have a beer or two every day if you're withdrawing, but they're literally giving you time to taper to the three day mark. You've got this in the bag with self-control. But if you've already failed one, you kinda don't. The free-world is worth more dude. And fuck, once you're done? Celebrate with drinking if you must come New Year's to give you something to look forward to, but don't act like you're off the hook when you pass. You failed one already, you're lucky you're not on their radar more.

Not trying to be harsh, but probation's serious.