These are the two rules that I found. We have more information on our Maine Marijuana Information page.
6.9.2.1 Documentation of current state residency shall be maintained in the
personnel files of principal officers and board members and shall
include, but not be limited to, a copy of a Maine driver’s license or
other state-issued photo identification and physical home address (not
mailing address) in Maine.
6.9.2.2 To maintain Maine residency status, each principal officer and board
member of the dispensary must spend in the aggregate more than 183
days of the year in Maine.