Since there is so much meth where you are, are you sure they are going to test for weed? A friend of mine worked in Las Vegas for a while, and when he went out there he didn't know anything about a drug test. The first day at the new job they took a hair sample and he figured he had lost the job, but it turns out they were testing for cocaine, meth, and lsd. The tolerance for marijuana in the workplace for this particular company must be high, but you never know... maybe they are just trying to weed out the tweakers?