Old thread but it's something I'm curious about. Of course it depends on how many panels they're testing for but it seems they're much better at finding close relatives. Obviously the usual stim suspects are a fail but I have no idea what else is on the wanted list.
I had friends that were taking loads of ritilin and getting tested for court no problem. That was almost 10 years ago and things change fast but that group of goods is probably safe. I wonder about cathies and the other groups, how close they are to amphs and what they metabolize into. They probably don't have the time or $$ to bother with a lot of it.
On the other hand. One time I'd done a xanxax bar. Tested over 100 hours, 5 days later, and they picked up a few nanos of 'metabolites of desinger benzo'. Whatever that is. When they tried to zero in on what it was it vanished. We had a laugh over it, it was for a med clinic not a job or court and they love me but I wasn't happy. I already knew none of the xanx in my area is the real deal unless you pick it up at the pharmacy, it was still odd. The worry is that some types like clonopin and valerie can stick around for 2-4 weeks and these outlaw ones could be unpredictable. Stick around in the same way. Obviously water soluable is better but it also means it doesn't work for long.