[Nateman]

Just out of curiosity I tried to find out what California's rules about OBD's were. What a can of worms! If you really want to know the answer to this check out this link, there is no way I'm going to dig through all this!

[right way right]

Wiki is pretty good at explaining OBD.
The Fed compliance has happened way back in regards to it, OBD systems came about so that the automotive companies could collect their sanity and benefit from standardization to deal with the EPA and CARB and all the horror.

http://en.wikipedia.org/wiki/On-board_diagnostics

[Ol' Dan Tucker]

Just out of curiosity I tried to find out what California's rules about OBD's were. What a can of worms! If you really want to know the answer to this check out this link, there is no way I'm going to dig through all this!

That link you posted concerns the OBD II installation on cars, not the regulations governing the scanner designed to read the OBD II, in short, because there are no laws against owning a scanner.

It makes no sense that retail establishments would sell in a state a tool that violates that state's laws.

FWIW, I downloaded the 2013 document and searched it and in the 151 pages it contains, the word 'scanner' does not appear once.