What type of “Drug Use History” would disqualify someone during a background check?

Question by Face on Fire: What type of “Drug Use History” would disqualify someone during a background check?
I am scheduled to take the written and physical tests for the Santa Clara County’s sheriff’s dept. this Saturday, however I noticed that the #1 reason people fail the application process is because of “Drug Use History”, it says (1-5 years depending on the substance). I have not been perfect my whole life and was wondering if anyone knew what they are looking for.

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