I've had one for a couple of years, and my wife has had one for many years. Yeah, it takes a doctor's note, but they're pretty easy to get. There are usually docs who will write you a note for one "for a small fee" in every town. Yes, you can get reported, and DMV is SUPPOSED to investigate, but they're so swamped, I doubt they really do...It could be the guy is using his wife's pass to park, but unless he's picking her up, that is illegal, as is the guy who uses his dad's pass at lunch...I know every state is different, but in Kahleefornnya, parking in a handicapped space illegally starts at $271, and for fraudulent use of a valid pass, could also include a separate fine for that, PLUS, the valid holder COULD lose their parking pass...now enforcing it is another story...cops tend to have WAY too much to do, to worry about the handicapped oarking spots, unless they happen to stumble on to it, or a business owner calls and complains...
BTW, some colleges have "friendly doctors" who write the orders for the football players and other athletes...like "preferred parking passes"...I LOVE it when they get busted for it...