PHOENIX -- As Arizona's medical marijuana program moves toward a launching point, the challenge is to keep it "medical." PHOENIX -- As Arizona's medical marijuana program moves toward a launching point, the challenge is to keep it "medical."

Dr. Will Humble, director of the Arizona Department of Health Services, said it would not take much to turn the legal program, approved by voters last November, into a recreational pot program.

"Thirty physicians who had really reckless care and writing certifications very quickly could turn this into a recreational program in probably a year," said Humble.

Despite the best efforts of the state, Humble said, "There will be recreational users that end up getting into the system... The evidence suggests that no state has been able to achieve a truly medical marijuana program."

He said the state will look for doctors writing lots of prescriptions for certain types of patients -- "people in their 20s and 30s in chronic pain, near universities."

Lisa Wynn is executive director of the Arizona Medical Board, which will review complaints about doctors who might have overstepped the law.