You'd have to be a really shitty security officer to leap from bong to illegal drug use. There's a reason it's legal to sell bongs, because they have lots of other uses than illegal drugs. Also, many of the drugs used in bongs are legal to use in many different circumstances.

The laws in Ontario are written this way to prevent exactly this sort of idiocy. That's why you don't even ask these things because it's irrelevant to the job.

If illegal drug use doesn't disqualify the President of the United States from his job why should it exclude anyone else?