IF he has reasonable and probable grounds. And if the vehicle is in plain sight.
Scenario:
Driver pulled over with bike in pickup bed, all fairing and numbered up.
"Where ya going?"
"Shannonville Racetrack for a track day"
"Oh. Well since you are just going on your way down the road, I think your bike is stolen, im just gonna jump up here into the bed and read the VIN number, OK?
"No officer, that's isn't OK, I'd like to not be unlawfully detained, and free to go on my way"
"I dont care, since I saw you down the road, my spidey sense triggered and I knew that you have a stolen bike and I am checking to make sure".
"Officer, I just want to go to the track with my track bike."
"Oh, well the VIN came back as someone elses, and isn't registered as stolen in CPIC. I'm just gonna seize it right here and now cuz I feel like it".
"But officer, I bought the bike from a machanic who had a mechanics lein on it. Here's the bill of sale".
"I dont care, I'm taking it anyway".
Sorry Hedo. It's just so rediculous, a police officer can't just go do whatever they want, and that includes fabricating out of thin air the just cause to search and seize.
Do you know what occurs when a person, even a police officer, seizes something unlawfully? It's called theft. That's a criminal offense, even if a police officer does, even while he is on duty. Intent is the key. Error is one thing. But purposeful negligence and willfull action to remove property from another person knowing it is unlawful, welp, is against the criminal code no matter who you are.