marijuana can remain in the body for weeks since it can be bound to body fat. some hair tests can show thc for months. there are really no medical conditions (including pregnancy) that would cause a false positive thc so most clinicians and law enforcement agencies would consider her test "positive" regardless of her conviction that she has not been using marijuana or around people who are. being pregnant and showing positive thc can be very problematic for her.
can any drug or condition cause a false positive for thc? can pregnancy prolong the time that thc stays in the body? . my daughter has tested positive for marijuana her last 3 drug tests but she has not been around anyone as far as i know. i am trying to trust her but i can not find anything on this. she is pregnant has had several urinary tract/kidney infections along with taking prenatal vitamins promethizine for nausea. we have not received any information on her levels to see if they are going down as of now but she is continuing to test positive.