I'd use a sieve, unless the rocks were REALLY big, in which case, ap's suggestion above is a good one.
Cannabis? I dont buy it. Probably other drugs involved! That really sucks man hope she straightens her act.
Pot is not that bad for you. Sure in the U.S it is expected to leave but in my honest opinion your family should provide a place to live until you can manage on your own although you should still have a job.
