Drug Test

How can I tell if THC is still in my system. Also what is the quickest way to get it our of ur system. If I just get a random test by parents or something, any kind of pill or anything to take for it to get out of ur system.. i havent done it in about 3 weeks, and I need to apply for a job, trying to make sure im clean... so yeah let me know.

taking enough niacan (vitamin b something?) to make you burn every day for about 3 or 4 days will speed the cleaning process along, make sure you drink alot of water and piss alot, as the thc will come out in your urine.