This is an incredibly short opinion that tops out at a mere seven paragraphs. In which Justice Yegan holds that a wallet with decorative metal spikes on the outside can constitute "metal knuckles" (e.g., brass knuckles) prohibited by Section 12020.
Watch out, all you ex-punk rockers out there. Those spiked collars and wristbands -- one of which I'm happy to say I still possess (a gift from Tallie Gray, if I recall) -- might potentially qualify as well.
Take that, Johnny Rotten.