For the final test, ARCCA used a dummy weighing about 200 pounds. A collision between the dummy and the SUV at that speed completely shattered the rear window, dented the SUV liftgate, and popped out the bumper window, Wolfe said.

The Karen Read trial on Friday focused on controversial testimony about the alleged collision involving Read's SUV and John O'Keefe.

Testimony is continuing Friday in the murder trial of Karen Read, who is accused of backing her SUV into her Boston police officer boyfriend, John O’Keefe, and leaving him for dead.