My dad did that few times. Now, we have cops use our lot as a speed trap. Back in the day, they did it on such a regular basis (bottom of a hill and a good hiding spot) that, to this day, you’ll still see people hitting their brakes as they come down the hill. That, we’ve never had any issue with. From our POV, the more often people see police cars in our lot, the less likely we are to get broken into.
However, for a while a cop, in an unmarked car, had set up a speed trap on a freeway on ramp. If you were coming from the West and making a left onto the ramp, it was hard to see him, but not a big deal. If you were coming from the East and making a right onto the ramp, it was hard to see him AND he was in your lane so cars had to swerve around him putting them into the other lane very quickly. It almost caused quite a few accidents just from what I saw personally. My dad started calling the police (non-emergency) to report a broken down Crown Vic on the on ramp, in traffic. After two or three times, they stopped doing that. He really was in the way there.
The cops in my area do that as well. On the one hand, we don’t mind getting the call and running back to the store to lock up. On the other hand, it means they set off the alarm, so the neighbors have to listen to it until someone can get there (and it’s really loud).
Getting back to the OP. Here’s my question. What happens if they open a car door and find something they wouldn’t have been able to see from the outside? Maybe they get hit with the pungent odor of freshly smoked marijuana? Maybe they see a gun or guns in the door pocket?
They just walk away, right? They certainly wouldn’t confiscate it or confront the car owner about it. That would be illegal search and seizure.
I have a funny feeling they’d watch for the person to drive away and find a reason to pull them over and then ‘notice’ the contraband.
My gut says it’s a bad idea. Even if their intentions are pure and wholesome, it can only end poorly. They might save a car or two from getting broken into. But how many people are going to have problems with their now locked cars? How many people are going to get in trouble for something cops saw in their car? How bad will it look for the PD when people start sharing doorbell camera footage of police opening car doors, or worse, we see the police rifling through a car because they saw (or smelled) something illegal. The funny thing is, the video will look no different then the videos we see of actual car thieves walking up and down the road checking cars and rifling through the unlocked ones.
How about this…a voluntary program. If you want the police to check your car door at night you tell them and if they happen across your car and have time, they’ll check it. All the other cars are left alone.
Similar to a program we had around here about 30 years ago. If you voluntarily joined this program, the police would note your license plate. If they saw your car on the road between some specific hours of the night (like 2am and 5am), they’d pull it over and verify that it’s you driving it. Never really went anywhere though. I presume a lot of people were less concerned that their cars would be stolen and more concerned they’d end up with a DUI.