Will you be drug tested right after a DUI sentencing?

when I got out of court they sent me straight to the probation office. He asked me if they tested me would I be positive for any drugs i said yes. Then he asked if I would leave urine for testing, I said yes. Then he said I wouldn't be in trouble, that they just wanted too know my levels. Dont lie you cant get in trouble the first test. But I strongly suggest quitting after that. Unless you want too go to jail!!!!!