No expectation of privacy for a LP, therefore a cop can run a LP without any reason. After running the LP the cop is shown that the citizen attached to the LP has a suspended DL, thus there is now a "reasonable suspicion" that the current driver of the LP is the citizen attached to the LP.
If it ends up that it is not the citizen with the suspended DL who is driving the LP, after visual observation, then that cop needs to get his back-side back in his car and move along...immediately...a "sorry...my bad" would be nice but is not mandated under any state law that I am aware of.
The last two times, as I referenced above, each cop posed the same question "Sir, do you know why I stopped you?" I replied "Please, officer, state your authority under RSMo 544.180 for arresting me."
That got both of them really ticked off since they both had to go look up RSMo 544.180. They tried to state that a traffic stop is not an arrest per USSC...nope, we have state statute that defines what an arrest is...try again and while you're at it review that part about what the cop must do.
Arrest.
www.revisor.mo.gov
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Both times I received a "you are free to go"..."not until I get your name and badge number, officer...and yes, this interaction was recorded..."
Sent the recordings and a nice note to the chief, requesting a informal meeting to discuss these two incidents...never heard a thing. Called the mayor and let him listen to the recordings. I got a call from the chief requesting a meeting a couple of days later..."No chief, you had your chance at a low level informal meeting...I'll be watching and recording...chief, have a good day a stay safe out there."