Poppy seeds would make a false positive for heroin use, not cocaine.Amoxicillin is associated with a false positive for cocaine. Have you been on antibiotics recently?According to this site:
http://www.netwellness.org/healthtop...sting.cfmThere are numerous herbal supplements and medications that can account for false positives.The good news is, you can dispute it and a second test, different than the first, should be conducted.