re: JoxRadio in B'ham w/ Al Delgraco

I have a question about the testing. If in a radom drug screen if a player proves positive for drugs, and he is suspended, do they test him again before he can play. Wouldn't he still be positive, and wouldn't it make sense for him not to play until the drugs are out of his system?
If they don't test again, doesn't it seem like the kids can roll the dice, and say well I was tested last week so I won't be tested again for a while so "lets party".