WASHINGTON — There have been many hundreds of varied rulings in the lower courts on when the use of Taser stun guns by the police amounts to excessive force, and sooner or later the Supreme Court will have to bring order to this area of the law. Next week, the justices are scheduled to decide whether to hear an appeal from three Seattle police officers who say they are worried about the future of what they call “a useful pain technique.”

The case involves Malaika Brooks, who was seven months pregnant and driving her 11-year-old son to school in Seattle when she was pulled over for speeding. The police say she was going 32 miles per hour in a school zone; the speed limit was 20.

Ms. Brooks said she would accept a ticket but drew the line at signing it, which state law required at the time. Ms. Brooks thought, wrongly, that signing was an acknowledgment of guilt.

Refusing to sign was a crime, and the two officers on the scene summoned a sergeant, who instructed them to arrest Ms. Brooks. She would not get out of her car.