It is very possible that your drug result was a false positive to methamphetamine
here are some examples of some false positives to methamphetamines
http://answers.google.com/answers/threadview?id=497244
http://www.supplementquality.com/z_askexpert/ephedra_testing.html
And if you compare the structures of Flexeril (Cyclobenzaprine) with Crystal Meth you will see that one has a N-dimethyl chain on it, and the other has a N-methyl chain, which is close in structure, and if there is a false positive, it could be the cause of it.
http://en.wikipedia.org/wiki/Cyclobenzaprine
http://en.wikipedia.org/wiki/Methamphetamine
I would just make sure you stop taking those Flexeril pills and ask to be retested in a day.




