There is only one company that makes a tool/reader that is able to read it and believe me, they aren't cheap since they have a monopoly on it since they were the ones who wrote the code and designed this feature. A dealership would have no reason to invest in the reader for this. Only law enforcement or insurance companies would have use for this.
There was a special on MSNBC I think and it was about how much all technology can be tracing what you do, whether it be something as obvious as GPS, or your printers, digital cameras, etc all have a form of tracking exactly which camera a picture was taken on or exactly which computer a piece of paper was printed from or exactly which disc drive a cd/dvd was burned from all tracked by putting the model number and serial number embedded in some way. And one of the segments was about the Airbag computer is literally a black box on cars and it dates back to ANY vehicle ever equipped with an airbag computer.
Kinda scary because they could easily write the program to store the data for even longer and then insurance companies could use that info to see how you drive and what your rates should be.
old article but has some info on the system... if you want to find out more, just
"airbag black box"
http://www.consumeraffairs.com/news0...es_states.html
here's a better one....
http://www.theairbagblog.com/how-air...ata-recording/