Yes, he was arrested.

Florida man offers to trade marijuana for food at McDonald’s drive-thru (Channel 10 Tampa, ABC):

PORT ST. LUCIE, Fla. - A Florida man was arrested Sunday after he tried to trade marijuana for food at a McDonald’s drive-thru, police said.

Port St. Lucie police said Anthony Gallagher, 23, was at the drive-thru of a McDonald’s about 2 a.m., trying to exchange a bag of marijuana for some food.

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Maryjane is not currency, even where it’s legal.