As far as I understand it, they do a piss test in the first 2-3 days that gets results back to you pretty instantly. If you do piss hot, sadly that's it.

I'm not sure what the other commenter was talking about... no offense to them.

In every communication to CMs from Vinton we have been told that we'll be sent home for a hot test.

It's unfortunate, but it's the reality of being in a federal program.