You have a right to call the police, or parking enforcement if someone who is NOT disabled parks in a designated space. The parking permit is assigned to the PERSON not to the VEHICLE. That's why they are now primarily mirror-hung placards and not license plates. The American's with Disabilities Act states clearly that the spaces are for disabled individuals, not for individuals who have placards.
I have called parking enforcement in the past.

Originally posted by 2kitties
I HATE it when unhandicapped people park in handicapped parking spaces. That is so rude and disrespectful. And, I've seen plenty of people park there who have the proper tag, but no visible problem walking or getting around. I think the handicapped spaces should be for people who have problems walking or who can't carry their bags , etc. Not for people who don't have any mobility issues.

My mom has a handicapped tag for use when she drives my grandmother places. She NEVER uses it when my grandmother isn't with her. But you'd be surprised how many people would use it. She's actually been offered money for it by some loser.

There are also spaces reserved around here for expecting mothers. I think that is great. But I don't think you should park there if you're in your FIRST TRIMESTER! If you're not showing, then park like the rest of us.