Quinn Emanuel Urquhart & Sullivan jumped headfirst into the marijuana economy on Monday, becoming the biggest law firm yet to boast a dedicated cannabis practice, and the first major firm to launch one devoted exclusively to litigation.

The 830-lawyer, litigation-only firm said its cannabis litigation practice group will be headed by Los Angles partner Robert Becher and will include over a dozen partners in six different offices. The firm’s website currently lists 15 partners in the practice, including Boston office leader Harvey Wolkoff, intellectual property practice co-chairman Claude Stern in Silicon Valley, white-collar and investigations practice co-chairman Alex Spiro in New York and insurance recovery practice chairwoman Danielle Gilmore in Los Angeles.