I would also agree with "noisebeam" and "va cyclist" - why leave anything to chance. If you feel at all as if you were being "set-up"(and I am guessing not), why push the issue ? Life's too short - avoid the "confilct" (unless that is your purpose in life) and get on with the ride.
BTW, my son is a police officer (he also concurs with the policy against "waving" motorists/cyclists on) ..... he doesn't have a moustache. He cycles with me whenever his schedule permits.
msm