by smoking so much that you forgot you smoked
no
no... only drugs that are chemically similar can occasionally cause a false positive.
Yes, Yes, Yes!! I took one dose of Zzzquil (the sleep aid from the makers of Nyquil) the night before and my UA came up positive the next day for alcohol.
Nothing, large amounts is possible to show a false positive for PCP though (unlikely).
No it can not. The tests read hormone levels and the drink has nothing to do with that.
Xanaflex WILL show up as a benzo in some cases ona standard UA.....false positive. FACT
Nope. Gotta be some alcohol involved somewhere. There is practically no such thing as a false positive for alcohol (although there are possible sources other than booze).
MDMA.. (molly, ex, ecstasy) is a common cause for positive AMP on UA
No, nothing they test for is in it! It's an anti-epileptic or anticonvulsant
opiates.
Most cough products which contain decongestants (pseudoephedrine, ephedrine, synephrine, phenylpropanolamine) can cause false positives with methamphetamine drug triage tests. The amount necessary which could cause a false positive depends on the detection sensitivity of the specific analyzer being used (they have different detection thresholds).
I am not a doctor but I do have experience with UA's and promethazine or as it is commonly referred to as Phenergan has nothing in common with cocaine so in my opinion it is very unlikely for Phenergan to give a false positive for cocaine. It is much more likely if you did come up with a false positive that the test is simply bad and wrong This has happened to me.