A South Carolina judge says an outside lab can analyze brain tissue of a black motorist shot and killed by a white police officer while running from a traffic stop.

Circuit Judge Clifton Newman on Wednesday granted a defense motion to allow a Pennsylvania lab to conduct forensic tests.

Attorneys for the former North Charleston police officer charged with murder in the April 2015 shooting death of 50-year-old Walter Scott have said there's no evidence state investigators ever analyzed brain tissue from the autopsy.

Defense documents filed with the court include a toxicology report showing traces of cocaine in Scott's blood.

The shooting was captured on cellphone video and reignited the national debate over the treatment of blacks by white officers. Thirty-three-year-old ex-officer Michael Slager stands trial in October.