There are two tests run on a sample: a "screening" test and a "confirmation" test. Naproxen will throw false positives for THC on screening tests, but confirmation tests can tell the difference between Aleve and weed.
Most test can turn up false postives. That has a low chance of happening though
becuz the FDA has outlawed them due to too many false postives. look up info on wiki inks
anxiety
With multiple results, an error in one won't mean a false result, as the other is tested as well to confirm it. The chance of both samples producing false postives or negatives is much lower than the chance of one.
will buspirone cause a false positive for benzodiazipies
Promethazine (Phenagren) can cause a false negative.
Can atenolol cause a false negative
ture or false do plants and amimals can cause weathering
False positive for methadone
No, folliculitis will note cause a false positive HSV2 result.
Yes. It is false that plant roots cause oxidation to the soil.
Yes, lithium can cause a false pregnancy on a pregnancy test.