If you get in, you'll be required to submit urine samples, whenever you're asked, at least twice a week in the beginning. You'll be closely observed while you're doing this, so you can't cheat, and you'd better not be shy. If you had other plans for this day, tough. Meanwhile, you'll be giving up alcohol, and that can be detected in urine, too. Never mind that the drug-testing industry is little regulated and susceptible to all sorts of mischief.
Poppy seeds can show up as opiates, and hemp-food products can produce positives for marijuana.
Prescription drugs can likewise confuse the testers. But those excuses won't fly, not in drug court. You'll also be entering a treatment program, whether or not you think you're addicted. The weekly regimen of random urinalyses and outpatient therapy will take its toll on your time. And don't forget your monthly appearance before the judge.