ANNAPOLIS — Maryland residents who can prove they have a doctor's approval to use marijuana for medical reasons would have a new defense to avoid a $100 fine and a misdemeanor conviction under a measure approved 41-6 by the Maryland Senate on Thursday. ANNAPOLIS — Maryland residents who can prove they have a doctor's approval to use marijuana for medical reasons would have a new defense to avoid a $100 fine and a misdemeanor conviction under a measure approved 41-6 by the Maryland Senate on Thursday.

Under current law, a person who uses marijuana for medical reasons can be charged with a misdemeanor and fined $100 in Maryland.

"What we've done is we're going to say we're going to give you a complete defense, an affirmative defense, where you have to prove by clear and convincing evidence that you were using it for medicinal purposes," said Sen. Jamie Raskin, D-Montgomery.

The Senate bill was changed this month, after legislation that would have created a state-run production and distribution system for medical marijuana stalled in the House of Delegates.

Caren Woodson, a spokeswoman for the country's largest medical marijuana advocacy group, said Americans for Safe Access backed the bill as a step forward.