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.

The Karen Read murder case is nearing its end. Both sides will return to the courtroom on Friday after a day off, and according to Read, her defense is expected to rest their case next week. After high temperatures and poor ventilation inside Norfolk Superior Court led Judge Beverly Cannone to cancel court on Thursday,