Massachusetts has a cannabis conundrum.

State law requires every county to have a dispensary for medical marijuana, but federal regulations forbid the drug from being transported across U.S. waters. That leaves Martha's Vineyard and Nantucket potless unless someone can be found to grow it legally on the islands.

The islands are their own counties despite their small size. State officials are leery of the federal restrictions and are suggesting it may be unrealistic to expect dispensaries to emerge on either island or on both.

Nationally, medical marijuana advocates are pushing for federal legislation to remove inconsistences between state and U.S. laws.

Geoff Rose is head of Patient Centric of Martha's Vineyard. He has applied to the state for a license to cultivate and sell medical pot on the island.