What is the difference between an oral drug examination and a urine sample examination?

Question by browndownlyricist: What is the difference between an oral drug examination and a urine sample examination?
I need to know how far back an oral examination is good at detecting drug use. I have an important interview coming up with a company I want to work for and if given the job, I will have to submit to an oral drug screening. I don’t know if I should have something to worry about or if it’s a less effective method than the urine specimen examination.

Best answer:

Answer by logic
reported.

for promoting drug use

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