The US Supreme Court on Tuesday declined to take up the appeal of a pregnant woman who was shocked three times with a police Taser after she refused to sign a traffic ticket for driving 32 miles per hour in a 20 m.p.h. school zone.

The woman, Malaika Brooks, was seven months pregnant and was driving her 11-year-old son to school in Seattle at the time of the speeding violation.

At issue in the case was whether police acted reasonably in deploying the Taser after Ms. Brooks refused to sign the speeding ticket and then refused to voluntarily exit her car to allow officers to place her under arrest.

The justices were being asked to examine under what circumstances police use of a Taser device crosses the line from acceptable law enforcement tactic to excessive force.

The high court also declined to hear a second police Taser case involving a woman in Maui, Hawaii, Jayzel Mattos, who was intentionally shocked with a Taser as police attempted to arrest her husband, Troy, following a domestic abuse allegation.

Both Brooks and Ms. Mattos filed suit against the police, alleging they violated their Fourth Amendment right to be free from the use of excessive force. Lawyers for the police officers argued that the officers were protected from such lawsuits by qualified immunity.

In both cases, federal judges ruled that the police officers were not entitled to qualified immunity, and that the cases should proceed to a trial.

The Ninth US Circuit Court of Appeals disagreed, ruling that even though the actions by police amounted to the excessive use of force, the law was not established clearly enough at the time of both incidents to give police fair warning that their actions were unreasonable and unconstitutional.

“We conclude that Brooks and the Mattoses have alleged constitutional violations, but that not every reasonable officer at the time of the respective incidents would have known – beyond debate – that such conduct violates the Fourth Amendment,” the Ninth Circuit said.

The high court decision not to take up the two cases allows the Ninth Circuit decision to stand.

The Taser incident with Brooks took place in November 2004. The 33-year-old expectant mother was pulled over by a police officer and issued a ticket for driving too fast in a school zone.

Under Seattle law, traffic violators are required to sign their tickets upon receipt. Failure to sign the ticket is itself a violation of the law.

After stopping at the side of the road, Brooks told her son to walk the rest of the way to school. She then told the officer that she did not believe she was speeding in the school zone and that she felt signing the ticket was an admission of guilt. She told the officer she wished to contest the charge.

Another officer and a police sergeant soon arrived on the scene. The officers insisted that unless Brooks signed the ticket she would be arrested and taken to jail. As further incentive an officer produced a Taser.

Brooks told the officer she did not know what a Taser was. She added: “I have to go to the bathroom, I am pregnant, I’m less than 60 days from having my baby.”

The officers attempted to physically remove Brooks from the car, but she held tightly to the steering wheel. One of the officers then used the Taser to deliver an electric shock to Brooks, first to her thigh, then her arm, and finally to her neck. The three shocks took place within 42 seconds.

She was then pulled from the car to the ground, handcuffed, and taken to jail.

A jury later convicted her of refusing to sign a traffic citation. No verdict was reached on a resisting arrest charge.

Brooks gave birth to a healthy baby girl in January 2005. Brooks has permanent burn scars at the Taser contact points, according to briefs filed in the case.