[MEGoody]

Why is it that handicapped marked vehicles are not ticketed when they choose to park in choice spaces and leave the handicapped spaces open?

Because there's no law against that.

[bwc2221]

It could be that although the person to whom the car is registered is handicapped, the person driving the car at the time is not (spouse, son, daughter, etc.) in which case they do not qualify to use a handicapped spot.