Schwartzenegger signing statement
Pdf here. It's his approval of AB 962, which among other things requires that all ammunition sales be face-to-face and that the seller record data on the buyer including, as I recall, a thumbprint.
The California legislation is meant to ensure that criminals, who are legally unable to get firearms, now won't be able legally to get ammunition for the firearm that they legally don't have. Or something like that.
Hat tip to reader Jim Dewey...