Bob pearson for the boston globe

Kayvan Khalatbari, owner of Denver Relief, is seen at the counter of his medical marijuana dispensary in Denver.

BOB PEARSON FOR THE BOSTON GLOBE

Varieties of marijuana were available at the 3-D dispensary in Denver.

BOB PEARSON FOR THE BOSTON GLOBE

A worker extracted THC from marijuana plants at the Dixie Elixirs facility in Denver.

matthew j. lee/globe staff

Khalatbari spoke at a Massachusetts Medical Marijuana Association training event Feb. 7 at the Omni Parker House in Boston.

matthew j. lee/globe staff

Kris Krane, managing partner of 4Front-Advisors.com, answered a question at the training event as Donna Rheaume, a speaker, listened.

BOB PEARSON for the Boston Globe

A worker in Denver filled a sample pack made by Dixie Elixirs for the medical marijuana industry.