Here's one possibility, if you've done DXM before.

http://www.erowid.org/experiences/exp.php?ID=24819

Also, Diazepam can cause a false possitive according to this. (supported by many other sites)

http://www.ultimatedetox.co.uk/drug-...-positives.htm

This one suggests taking Effexor causing a false PCP possitive.

http://www.bpinews.com/Breaking%20Ne...eakingnews.htm

I hope this helps you. good luck
mrdevious Reviewed by mrdevious on . HELP!!!!!!! PLEASE!!!!!!!!! i didnt use pcp but it showed up in my system i have a cotton swab test friday and i wanna know how long pcp stays in the system just in case... i dunno why it read pcp though,.... Rating: 5