Reasonable suspicion is needed for a detention. Probable cause is needed for an arrest/summons.
If I see someone with a beer and that person appears to be under the age of 21, I can check ID. That's a detention based on reasonable suspicion. If I determine that they are underage, they're cited for it - that's based on probable cause. Reasonable suspicion provides the opportunity to investigate further. As I said, if the OP had a handicap placard, I highly doubt the officer would have written the ticket.
I understand the difference.
If you see someone with a beer who does NOT appear to be under 21, can you force them to prove they're 21? That's more analogous to this situation. The OP didn't have any information that would lead him to believe the OP wasn't handicapped. He was detained because he was pulling out of a handicapped spot,
not because he was pulling out of a handicapped spot and the officer reasonably believed that he was not handicapped.
Edit: Trying to articulate this a different way... reasonable suspicion means that a person could reasonably believe that a crime has occurred given the known facts, right? And in order to believe a crime has occurred, they'd have to believe all elements of the crime are present, right? It's illegal for someone who is under 21 to drink alcohol, so if you see someone who is drinking alcohol
and appears to be under 21 then you could reasonably believe they're breaking the law. You have reasonable suspicion to investigate further.
It's also illegal to park in a handicapped spot unless a handicapped person was in the vehicle and a handicapped placard was displayed while the car was parked. A person could reasonably conclude that the OP parked in a handicapped spot. A person could not reasonably conclude that the OP had parked without a handicapped person in the car or without displaying the placard, because at the time the OP was seen the placard would
not be displayed (it would block his vision while the car was in motion) and there is no way to tell by looking at his car that the OP is not handicapped. Therefore how could a person
reasonably believe that a crime had occurred? They couldn't.
An example of a similar situation where I believe there would be reasonable suspicion - cop sees car parked in handicapped spot with placard, but cop sees a guy who had clearly just finished playing tackle football get into the car and drive away alone. A person could reasonably believe that guy was not actually handicapped.
Now if you're telling me that reasonable suspicion need not be based on a belief that all requirements of the crime have been met, then I think that's unfortunate. I
hope the constitution protects us against that.