you say you smoked last month (so 2 months ago, right?) especially cuz its leg hairs, it sounds like they have nothing on you. and the stuff only remains in ur system for a while if you smoke a lot (around every day, not just one a month)
naa dude,u good..if its been a month then the only thing that u should worry bout is a blood test,because they test 4 THC and its in ur fat blood and urine,if its been more than 2weeks nd u loss sum weight u safe 4 a piss test