help passing probation random drug tests

ok, so my best friend got nabbed today for smoking on school property. she didnt have anything on her but the girls she was with had almost a quarter and 30 vicodins without a perscription. their hearing is on june 30th but apparently the judge said today that if they got "in any trouble whatsoever until then they'd get thrown in juve". now angie is a huge stoner naturally, we smoke anywhere from an eighth or more a day. so that pretty much means she can get away with a positive result for about a month, right? and if she gets put on probation (which she undoubtedly will), is there any way at all to continue to blaze but be able to pass random drug tests?

any help would be greatly appreciated.