Not personally, but I can say that the poly is BS and a POS    Whether administered in the States, Canada, Europe, or on Pitcairn Island, it's still junk.

Your friend should not have been questioned about sexual proclivities or activities.  Homosexuality is condoned even more in Canada than in the States, I submit, so what would it matter?

As to adultery, let them ask his wife or acquaintances if such a thing has happened.

Cheating on your girlfriend?  That's legal, if caddish.  Until you say "I do," you haven't, and what you do for recreation is your business, provided it's not a crime.

This whole topic is taboo even to polygraphers themselves.  Polyboys know that such questions will elicit a raised level of biofeedback no matter the truthfulness of the victim, er, examinee.  They also know that such a spike makes any interpretation impossible (as if it weren't before).

If you still want to deal with an organisation that utilises the poly, read The Lie Behind The Lie Detector in its entirety, and re-read ch. 3 and 4 in detail.  Study the tactics, drills, and procedures.  Focus.  Wax on, wax off...   And you should be in better shape...