Eating raw marijuana cause you to fail drug screen? Note: I do not smoke marijuana, nor am I around any illegal substances. One of my friends smokes this, he said he quit smoking the past month for his drug screen but continued to roll blunts and joints for his other friends. He developed a habit of licking the raw sticky residue off of his fingers after rolling. I told him for marijuana to realease THC heat is essential. Do you agree or is there a possibility he will fail his drug test next week? Thank you.