There is often a gap between the language of ballot measures like California’s and the detailed regulations needed to get marijuana markets off the ground. And the referendums that voters approve often call for quick implementation, giving legislators and regulators little or no time to enact policies before the drug becomes legal.

“There’s no perfect implementation, there’s no perfect legalization effort,” said Michael Correia, a federal lobbyist for the National Cannabis Industry Association. “There’s going to be hiccups.”

Read more: http://www.pewtrusts.org/en/research-and-analysis/blogs/stateline/2017/01/27/as-more-voters-legalize-marijuana-states-left-with-regulatory-hurdles