Rapper Saviii 3rd Arrested for Stolen Studio Equipment, Drug Possessi

L.A. rapper Saviii 3rd won't be getting tricks or treats on Halloween, instead, he'll be in court for an arrest -- cops say he bolted out of a studio session with over $3,000 worth of equipment.

Burbank police sources tell TMZ Hip Hop ... Saviii was recording inside Royal Rehearsal studio Wednesday night before he allegedly stole a speaker, mic, mac hard drive and a monitor ... and a few other pieces of equipment.

We're told officers detained the ex-Cash Money Records artist and his entourage in the back of the studio's parking lot. Saviii, whose government name is Tyrus Washington, identified himself as Johnnie Lee Brown ... according to cops.

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