Despite being the first state to legalize recreational marijuana, Colorado still doesn't have a certified marijuana workers' union. That could change, though, if a National Labor Relations Board hearing goes favorably for a group of workers at a Denver cultivation warehouse. After a hearing scheduled for March 11, the National Labor Relations Board will decide whether workers at a Denver marijuana grow owned by TweedLeaf will be recognized for a union certification vote with the Bakery, Confectionery, Tobacco, and Grain Millers Union Local 26 chapter. If the NLRB approves the move and 75 percent of the growing operation's employees vote in favor of certification, the TweedLeaf employees would become the first marijuana workers' union in Colorado, after several failed attempts across the state.