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.

Damage to Karen Read’s taillight was inconsistent with striking an arm at 24 mph, ARCCA accident reconstructionist Daniel Wolfe testified.