What can cause false positive urine for amphetamine?

other cold remedies can apparently produce false reports of methamphetamine usage.

Some additional over the counter medicines that may cause various kinds of drug test interactions include Alka-Seltzer plus, Allerest, Bronkaid, Contac, Donnagel, Sinuntab, and Sudafed.

Aspartam Coke Light or Neotam can do this ...

Me i have PKU and it always will 8-)