A worry for anyone undergoing an illicit drug screen – whether it be a urine, hair, saliva or blood test – is the possibility of a false positive drug test. In fact, some data suggests 5 to 10 percent of all drug tests may result in false positives and 10 to 15 percent may yield false negatives.
What can cause a false positive on a urine drug screen?
What Can Cause a False Positive Drug Test
- Secondhand Marijuana Smoke. 1 / 11. If you hang out often with someone who puffs on pot, your urine could have traces of THC. …
- Weight Loss Pills. 2 / 11. …
- Poppy Seeds. 3 / 11. …
- Mouthwash. 4 / 11. …
- Antidepressants. 5 / 11. …
- Antibiotics. 6 / 11. …
- CBD Oil. 7 / 11. …
- Antihistamines. 8 / 11.
What is the most common false positive drug test?
False-positive results for amphetamine and methamphetamine were the most commonly reported. False-positive results for methadone, opioids, phencyclidine, barbiturates, cannabinoids, and benzodiazepines were also reported in patients taking commonly used medications.
How often are drug tests false-positive?
Drug tests generally produce false-positive results in 5% to 10% of cases and false negatives in 10% to 15% of cases, new research shows.
How can I get a false negative on a drug test?
False-negatives can occur when the urine drug concentration is below the threshold level set by the laboratory performing the test. Dilute urine, the duration of time between ingestion of the drug and time of testing, and the quantity of the drug ingested may affect the occurrence of false-negatives.
What food causes positive drug test?
If you are mistakenly found positive for drug use, think about whether you have taken any substances known to cause false-positives.
|If you take or eat:||You could test positive for:|
|Hemp food products**||Marijuana|
Can a positive drug test come back negative?
When a drug is present in such high concentrations that there are no more binding sites left on the antibody, the sample may present with falsely low values. If the low value is below the test cutoff, the result will be negative. Although this is rare, it cannot be ruled out, nor can it be predicted.