A coalition of 22 state attorneys general is calling on Congress to address “the glaring vagueness” that has led to legal cannabis products being sold over the counter across the country — including sometimes from vending machines or online.

letter dated March 20 addresses the consequences of Republican lawmakers’ choice to legalize hemp production in the 2018 omnibus Farm Bill — a decision that perhaps inadvertently led to a multibillion-dollar market in intoxicating cannabis products that are arguably federally legal.