From a moving cars, while the pick-up was parked, eh?
The only way they could have seen anything is to get out and walk-up to the pick-up and look in the windows.
So again...
What was the probable cause for these police officers in unmarked cars to stop and investigate Mr. Scott and his parked vehicle?
This has the smell of racial profiling all over it; Keith Scott was guilty of 'parking while black'.

OCU