A Maui man allowed to use marijuana to relieve back pain has been ordered to pay a $300 fine.

Under a plea agreement with prosecutors, Douglas Kaleikini of Wailuku pleaded no contest to a misdemeanor charge of criminal conspiracy.

The 55-year-old Kaleikini had faced a felony charge after he and six others were arrested last year following a two-year police investigation dubbed "Operation Weedkiller."

He was accused of buying marijuana from a group that allegedly exploited state medical marijuana laws to sell the drug to hundreds of people.

Kaleikini said he thought the sales were legal.

During sentencing Tuesday, Circuit Judge Joseph Cardoza said Kaleikini could continue using marijuana to ease his pain as long as he was authorized by the state.