lane, striking mrs. thompson's vehicle. >> but what evidence was there that justine had done it, as the law says, purposefully? investigators pulled the so-called black box out of justine's pontiac and analyzed the data and found another sign that pointed to suicide. she'd taken off her seat belt. black box also recorded speed, acceleration and braking and found that justine was accelerating, flooring it, so to speak, in the five seconds before the crash, speeding up from 81 to 86 miles per hour before hitting the brakes at the last second. >> she did not swerve. and she drove head-on into that other vehicle. >> to back it up, prosecutors pulled the speedometer from justine's car, and there above the mark an of 85 miles per hour found an orange mark.