RE: DNR
It used to be that way in Minnesota, where they could do pretty much whatever they pleased, but now that got changed and they have the same or maybe less power then a normal cop.
About asking permission to look into a vehicle, my cousin is a cop, and he said that they can look into vehicles as long as they dont break the thresh hold of the vehcile, so they can look into the bed of a truck, or through any windows.