The Maryland Department of Natural Resources police has dismissed its internal complaint against an officer who wrote to the department secretary and other elected officials to complain about a sexually explicit quiz distributed by some of his colleagues.

The department police canceled its formal interrogation of Cpl. Michael G. Sewell this month and declined to take any disciplinary action against him, Sewell's attorney, Alan Legum, said yesterday. "We feel he has been totally vindicated," Legum said.

Last month, Sewell, president of the department's Black Officers Association, sent a copy of an "Official Game Warden Sex Quiz" that was distributed at two police training sessions to department Secretary Torrey C. Brown, complaining that the document violated a department rule barring the distribution of offensive literature. Within a week, he was notified that he was being investigated for breaking that same rule.

The three officers who originally distributed the quiz, a series of 24 true-false questions involving sexual terms, have been disciplined, although it could not be learned what action was taken.

Instead of disciplining Sewell, the department put a "letter of counseling" in his personnel file expressing displeasure that he went outside the department with his complaint. Sewell intends to file a grievance over that action with the state employees union, Legum said.