Anything that can be used as blackmail and/or show lack of good judgement/trustworthiness. Different agencies have different requirements, but past drug use is

Anything that can be used as blackmail and/or show lack of good judgement/trustworthiness. Different agencies have different requirements, but past drug use is usually not an issue as long as it's disclosed. The FBI/DEA has/had stricter rules on drug use likely because part of the job could entail dealing with drug seizures.