Ya a couple of times and it depends on what sort of Officer you are dealing with.
I had a National park ranger pull me over 2 years ago, on a guided mountain lion hunt. I had a Cameraman and a Hunter in the truck, who happened to be hunting with a Custom DPMS Ar15 in 6.8 spc.
We were outside National Park boundries on national forest Looking for the track of a lion that had lost the dogs down in the canyons. I was diving approximately 5mph with my head hanging out the window looking for the track, when lights came on behind me. I was aware of this rangers personality (from talk around town, I had not yet had the pleasure of his acquaintance lol)so I had seen to it that my hunters magazine was laying on the back seat and the rifle was clear. The officer proceeded to tell me he had pullled me over for "speeding"
and wanted to check our permits and weapons. The hunter lifted the Ar, muzzle pointed to the roof and with his left hand drew down the charging handle exposing an empty chamber.
The officer was obviously not happy with the weapon.
"where is the magazine" asked the oficer
"in the back seat" replied the hunter.
"well sir the magazine has to be locked away either in the bed of the truck or in the Glove box, so what you have is a loaded weapon. again
Long story short we were not ticketed and the ranger was not around for much longer, but I have found that conservation officers in this area are about 70% Jerks (nicest word i could use without swearing)and 30% salt of the earth nice guys. When dealing with the Jerks, every encounter is like a DOT truck inspection. Every person is a criminal they just havn't been caught yet.
2 days later we were standing out side the vehicle and the hunter was showing the AR to one of my friends who was looking through the optic. A different officer drove by and stopped, backed up and pulled in next to us. He stepped out cautiously, hand covering his weapon. But the hunter quickly engaged him in conversation, asked him if he wanted to look at the rifle and within 2 minutes the officer had his trunk open and was showing us his Colt AR15 and we were talking guns and having a good ol time.