Many cold medicines can lead to false positives for methamphetamine.
Also, Wellbutrin or trycyclic antidepressants (doxepin, amitriptyline) can do so as well.
Hi I agree with Froger some one might have tryed to ''tune up'' your weed with some meth...also those tests get mixed up once in a wile I was at the clinic for almost 7yrs and got a test back for cocane they agreed to retest the sample at my cost (35.00) ant it came back clean they did not give me my money back ether have them run it again as you already may know it is all about the money at a methadone clinic when your ready to quit we will be here for you we have a lot of members that have beet this hideous drug myself included let us know how this turns out for you until then your back at the clinic every day...............Gnarly
It could possibly be the weed. Weed nowadays is usually mixed with other drugs, it's possible it was mixed with amphetamines. Are you looking to quit?? If so, you've come to the right place. Take care...