MILFORD, Pa. — A judge has stopped enforcement of a northeastern Pennsylvania school district’s policy to require students to submit to random drug testing as a condition of participating in extracurricular activities or driving to school.

Pike County Judge Joseph Kameen says the policy is an unconstitutional violation of students’ privacy. He issued a preliminary injunction against the Delaware Valley School District.

The school district argues the 13-year-old policy is needed to protect student safety and health, and to get help to students found to be using drugs or alcohol.

Two sisters and their parents sued the district in March. Parents Glenn and Kathy Kiederer said Tuesday in a statement distributed by the American Civil Liberties Union of Pennsylvania that their daughters “do not shed their constitutional rights on school grounds.”