The video that comes to mind (easily found on youtube) is the kid who was pulled over for a tag light and the deputy saw a used condom in the door. He had the kid exit the vehicle to "show" him the light and then asked him if there was anything else in the car he needed to know about. The kid said no. He said to him, well if you dont mind stand there for a second and Im going to check it out and get you on your way. No reason at all to search, no permission, he even stated to the camera that the car smelled like BO and made no mention of smelling anything else. No K9, no "odor of burnt marijuana" and no mention of seeing anything out of the ordinary and yet the kid was removed from his car and had it searched. The video is funny becasue its gross, but I was very struck by how that cop handily got his search in on a young kid who probably didn't realize he could have said no.
The guy is a lot younger than I am, but I wouldn't call him a kid, as in 16-18, but who knows. He clearly gave permission to search his vehicle. I noticed that after Denton (ironically, the same cop being accused of being mean and harrassing to the LinkedIn guy) talks to the driver about the cover to his tail light, which needs to be in place - he gives him only a warning - not even a ticket.
In the video - then the trunk is open, and the next thing you see is Denton basically getting permission from the driver to search the front of the vehicle. He did joke with the guy the whole time, the guy took it in stride, but he was courteous, as well as compliant. Denton looked through the console and as best as I could tell - that was pretty much it. He looked, he didn't see much (except a big mess and also condoms all over!) and he let the guy go on his merry way. With only a warning. Not even a ticket. No big deal was made of the search, which was not illegal by any stretch of the imagination.