ya know ,i bounced around the web this morn,and the information is so conflicting.... they don't have to take hair from your head,anywhere is fine....then again the same(and 2 other)site says weed is undetectable after a week....(hair and nail drug testing.com).....which is B.S...other sites say "if we can harvest a sample,we can test,period....so wh to believe?....certainly not(government,anybody "selling"anything......if you smoke and your place of work "tests"...get a KNOWN good sample....or fear for your job.....you guys know after all the years this site has been up,if somebody would have come up with a "sure fire" way to pass,and it would be common knowledge......