Yes, I believe its possible to test for psilocin and psilocybin in a UA drug-test. However, I have never heard of anyone testing for magic mushrooms... I believe the standard NIDA-5 drug tests only check for marijuana, cocaine, amphetamines, opiates, and PCP. (But dont quote me on this ) So you're good to go. If, by some really, really shitty stroke of luck, you were given a test designed specifically to detect psilocybin- I dont know what to tell you. I'm not sure how long the compounds of hallucinogenic mushrooms remain in your system. But like I said, so long as you are taking a standard drug test, and not one specifically made to detect psilocybin- you're golden.