Odd Results on home Drug Test

i recently posted about this in the recreational or experience boards, and i recieved no clear answer. Heres the scenario: my mom bought a home drug test cause she found my bowl, it is something like a First Check. You piss, take an eye dropper full of piss, and drip it on a circular hole on the panel. the categories are the Control, THC, METHamphetamines, COCaine, and OPIates. Before i took the test, i hadn't smoked weed in 2 months+, i have never done blow or heroin, and i take Concerta 54 mg every morning. I took the test, and i tested positive for EVERYTHING. and the control, which confirms the other results. The Concerta accounts for the Meth, but can THC stay in my system for 2 months plus (im a skinny dude) and where did the coke and heroin come from? please help...

I have concluded those test are complete crap.
Everything sets them off, Ibuprofen, Tylenol whatever.
Tell your mother they are junk.
GC-MS is the only legal way to prove you have something in your system.
The antibody test (home test are anitbodies) are just screens and not worth a damn, they are easily beaten and come up with false positives all the time.

Any real lab uses Antibodies for screens and confirms with GC-MS so they dont get their asses sued off.

Does your mom think that since you tested + for everything that you really do them all or does she believe you that you dont do them?

well i was just fuckin around cause she totally forgot about the test, so i took it for fun.