Accuracy of a Drug theory test?

My friend needs a drug test to be employed at target. He recently smoked marijuana on tuesday, and a drastically slight amount on sunday. When he tried one of the bring them home drug tests, he passed and did not apparently have any THC in his system. Does this be determined he will pass the test, or should he get the proper "drinks" that clear out your system to leave behind the test? The test is being perform at the local labcorp.
Answers:
Marijuana (THC) will show up in a urine test up to 21 days after it was ingested.
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