They want to pick the low-hanging fruit and make examples of them.
Anyway, I think this thread has run its course. The O.P. got the job \o/ , and further discussion might well stray beyond the limits of the BLUA (we cannot condone discussion of how to cheat drug tests on here). Which is not to point any fingers. Let's just say, congratulations on being sensible enough to let it get this far and now I'm acting like I'm your mother or something.
If anyone has anything important to add, you're welcome to send a PM to any member of staff, and we'll remove the padlock.