Well i have seen a place that say they have a way to pass a hair drug test but you have to pay for it and im sure you prolly need a credit card and considering your worried about your mom and dad drug testing you im assuming your not 18 and dont have a credit card so you shouldnt be on forums but ill overlook that because i smoked weed the first time when i think i was 12 lol early i know but im big so i mostly only hung with older kids but anyway
i would say for a piss test marijuana can stay in your system for 3 months and for hair tests i think its a really really long time but if they are nieve enough i suppose you could say it is still in my system from the time i smoked any internet searched well tell them but it only sstays in your system 3 months if you smoke i think 3 times a week or more and if you never smoke and smoked once which im assuming last time you told them it was the first time it could leave your system in days piss test wise but i dont think they would read or find that if they did look up how long it stays in your system
have fun