A Washington Boy Scout executive was arrested yesterday and charged with possession of marijuana after D.C. police confiscated what they said was $150 worth of marijuana from him.

Police said Kenneth Edward Spann, 25, of 414 Franklin St. NE, was arrested in the 1600 block of 11th Street NW, one of several persons arrested throughout the day in the area as part of the police department's current crackdown on illicit drug traffic. Spann was stopped in his 1979 sports car by officers who spotted what looked like an unlit marijuana cigarette in his mouth, police said.

After searching Spann, police said they recovered nine $5 bags, three $10 bags and three $25 bags of suspected marijuana.

Police described Spann as a Washington district executive of the Boy Scouts of America.

Rudy Flythe, executive director of the Boy Scouts of America, said Spann is a member of a three-man team that primarily recruits adult volunteers to work with the 8,000 Boy Scouts in the District of Columbia.

Spann, himself an Eagle Scout, the highest rank in the youth organization, told police he is a native of the District and graduated from St. John's College High School here and from the University of Kansas in 1978 with a bachelor of science degree in journalism.