The demonstration today afternoon was intended as a protest against federal interference with states that have legal marijuana.
Possession of up to 2 ounces of pot is legal in the District of Columbia, and the demonstration was held on city land rather than federal land in an attempt to comply with that law. But in a statement, police say they invoked federal law in making the arrests.
Police say a man and two women were charged with possession with intent to distribute, while four women were charged with simple possession.