Is there anything an "equate 12 panel drug test" from Walmart can't detect?

It covers: opiates, amphetamines, pencyclidine, antidepressants, barbiturates, benzos, methadone and oxy. Also a few other ones like X, weed & coke.

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Does that pretty much branch over most street substances that you -snort- to get high ?

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Like for instance if someone snorts Adderall, hypothetically the test would detect it as an amphetamine ?

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More importantly if someone passes this test randomly does that more than likely mean they're clean? If administered correctly.

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......my partner has been showing a hand full of signs of cocaine/stimulant use, he willingly took the test and it was negative across the board. I'm still worried about the unexplained behavior, maybe he's doing something that this kit does not test for. I mentioned the test may 18th, but felt guilty. He tested may 26th.