Drug Testing - False Positives

False positive is a technical term for a substance, which tests positive falsely for another compound. A common example is poppy seed testing positive for opiates. This would be a false positive. This is the purpose of the confirmation step of the drug test, which utilizes the GC/MS. The GC/MS can differentiate between Ibuprofen and marijuana, or poppy seeds and opiates.

Marijuana over the counter NSAIDs (non-steroid anti-inflammatory drugs) such as Ibuprofen, Advil, Nuprin or Pamprin.

Prescription NSAIDs anaprox, Tolectin, ifenoprofen, Lodine, Motrin etc.

Amphetamines Over the counter remedies that contain ephedrine, psudoephedrine, propylephrine, or desoxyephedrine. These medications include Nyquil, Contac, Sudafed, and Allerest 12 hour, Tylenol Sinus Gelcaps, Vicks inhaler.

Cocaine prescription antibiotic Amoxicillin.

Opiates Emprin, Tylenol with codeine, rifampicin, prescription with vicodin, Percodan, percoce, wygesic.

Barbiturates Fiorinall for tension headaches or Phenobarbital, Dilantin.

Benzodiazepines most prescription sleeping pills and anti-anxiety medications.