

Sort of. They would be liable to alert on people who HAD consumed drugs earlier or had been around people that had consumed drugs. Furthermore it has been shown in a scientific study that dogs alert in part based on their owners suspicion even when not deliberately signaled to do so and since such suspicion is liable to fall on minorities just serves to justify the dogs masters pre-existing judgement.
Often even functional companies are in effect run by rank and file people paid almost nothing who know their particular aspects of the job very well. They are managed by people who as your rank rises know less and less about the actual work that makes the company run. This works fine when nothing major changes but when you ask people incapable of doing the job to make major strategic to the enterprise that they don’t understand shockingly it goes poorly.