Does anyone answer "Yes" to this question?

It's the Holiday season which means increased police presence on the streets in the form of the police roadblocks to check for impaired drivers.

As I have to cross a bridge to get home from work I generally run into these roadblocks a few times over the Christmas period. So far I've only encountered one, this past Thursday on the Cambie Bridge, and since I never drink before leaving work it simply means I'm delayed a minute or two in line waiting to be questioned. The procedure is pretty standard, or it was before this last stop, an officer will ask where you're coming from and whether you've consumed any alcohol and then decide whether or not you need to be tested further.

On Thursday after being asked where I was coming from, "On my home from work", and whether or not I'd consumed any alcohol, "Not yet", I was then surprised by the next question:

"Do you have any illegal drugs or firearms in the vehicle with you ?.

I paused a second, then answered "No, it's Thursday" which got a small chuckle from the officer and a wave to go on home.

The rest of the way home all I could think was: Does anyone ever answer "Yes" to that question?. I mean seriously, if I've got a kilo of weed and an RPG in the trunk is it likely I'm going to say "Damn, I was hoping you wouldn't ask but yeah I guess you've got me now" ?