Leafly has the following AP piece
Just as entrepreneurs getting into the retail cannabis industry need a good lawyer, some of those lawyers might be wise to consult an attorney of their own.
Lawyers in the burgeoning business are entering a legal gray zone where the drug is permitted for some purpose in most states but illegal under federal law — in the same controlled substances category as heroin. Missteps could lead to prosecution for conspiracy, money laundering or aiding and abetting drug dealers.
“Any lawyer that goes into this should be aware that a literal reading of federal law permits such a prosecution,” said Sam Kamin, a University of Denver marijuana policy law professor, whose research five years ago found lawyers more susceptible to being disbarred than criminally charged for cannabis-related work. “It probably makes sense for a lawyer to at least talk to a legal ethicist or get an opinion from a legal ethicist.”