Ok, I have past the last 15-16 supervised tests so I will speak on what I know.

Synthetic- I don't use it. Fuck it. I still have it but don't intend on using it. I'm almost inclinded to say that I have heard of people still failing with it but I'm not sure.

I use a friend's urine. Alcohol is supposed to be out of your system by atleast 48 hours- usually much sooner than that.

They aren't screaning for alcohol, just drugs so that shouldn't be a problem.