Dead Man Crashing

Did anybody (excuse the pun) see a documentary with Sterling Moss, which looked at the use of cadavers in the research of crash impact on car passengers .
In America, it would appear that real dead bodies are used to measure possible head and spinal injuries in the event of crashing.
Here are some questions for the researchers:
Where do these bodies come from? and do their relatives know?
Have they had their organs removed?
Who cleans up after the crash?
Does one have to carry a card, like a sort of `anti´organ donor card in order to avoid being used as a cheap alternative to crash test dummies?
Are the cadavers kept in the deep freeze and de-frosted for the action scenes? Or do they have a 'sell by' date?
I've never minded having my body used for scientific research, after death preferably, but do i really want to take part in what must resemble a sequel to Night of the Living Dead?
When our loved ones depart, do we really want them to embark on the journey into the afterlife by being flung out of a Porsch at 80 miles per hour whilst doing a passable impersonation of Boris Karloff. I think not!