Slightly more detail at Mashable: https://mashable.com/article/dmv-vanity-license-plate-def-con-backfire/
«"Basically," observed Droogie, "this is bullshit”
After contacting the DMV and the LAPD, and painstakingly explaining his situation, they both told him the same thing: change your plates.
"I said, 'No, I didn’t do anything wrong.'"»