False Positives
False positive drug tests can result if you donít take care Ė in fact many OTC drugs can lead to a false positive drug result on a blood or urine drug test, as well as saliva tests. Make sure you are very careful with what you take if you know you have a drug test coming up, because as much as 30 percent of tests results in a false positive result. These are some of the common items which can lead to a false positive on your drug test:
Certain antibiotics such as Penicillin and Tetracycline can cause false positive results for heroin or cocaine.
Cold remedies, diet pills, hay fever remedies and pain relievers:
In blind testing, decongestants and many diet aids resulted in false positives for amphetamine use in one third of all test samples given to 40 leading substance testing laboratories. There are more than 300 over-the-counter drugs that can cause false positives on the EMIT, and new drugs being introduced every day.
Dental/Medical treatments:
Cain-based products, especially Novocaine, have been known to cause false positives for cocaine. Some legal products actually contain small amounts of illegal chemicals. All urine tests, including GC/MS will indicate a positive result because the metabolites derived from the substance are identical to the metabolites of the illegal drug.
Ibuprofen is a common pain reliever that, even in low dosages, can cause a false THC positive on the EMIT. This has supposedly been corrected.
Poppy seeds:
Though an extremely concentrated amount of poppy seeds are needed to obtain a false positive for opiates on the EMIT, it is possible.