Charles Gunn, having had the legal upgrade

The legal upgrade was a medical procedure performed by Doctor Sparrow, who performed freelance jobs for Wolfram & Hart. He performed it on Charles Gunn, granting him absolute knowledge of all human and demon laws, as well as fluency in some demonic languages, knowledge of golf techniques, and all Gilbert & Sullivan light operas.

According to Gunn, the upgrade didn't actually enhance his mental capacity, but merely "revved up some idling brain cells."

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