Marijuana can take up to 30 and even 45 days to get out of your system, depending on your body mass and how much you smoke. How long has it been since you last smoked? If you get a drug test anytime soon, it will probably be in your system anyway (assuming you've smoked recently). Lots of my friends have passed drug tests by drinking a whole lot of water before you go to piss in the cup (some piss once before pissing in the cup). That way, you're body is forced to just get rid of all that extra water. Don't trust vinegar, or pills, or bleach, or goldenseal, or any bs. I would quit, show your dad a clean drug test or two, give it time, and lay low. Good luck.