In February 2015 a federal judge upheld the microstamping requirement, ruling that it does not violate the Second Amendment.[9]
Similar legislation is under consideration in New York,[11] Connecticut, Rhode Island, Massachusetts, Maryland, Wisconsin, and Illinois.
Microstamping legislation was passed in California AB 1471 and signed into law on October 14, 2007, but specifically exempts law enforcement.[4]

Wow!
I wonder why law enforcement is exempt if it is such a good idea?