prosecutions expert testified there was in no doubt justine crossed the centerline and veered into erin thompson'sing the crash. but referencing engineer hired by the defense said his research turned that finding on its head. he claimed it was erin who drove out of her lane in that construction zone and struck justine. and the defense went further. claiming that slap a mark near the 85 mile per hour mark on the edge -- was planted there by investigators. that the black box had measured speed and breaking was plain wrong. that justine always or her seatbelt. and finally, a psychologist said -- will actually a lot of experts said the spat with the boy wasn't enough to lead to suicide attempt. that those checks, they should not be considered a suicide note at all. >> it was a way of exercising power and control in the relationship. to make that kind of threat. but it was always clear that it was never meant. >> what would justine winters say about what happened here that night. about those checks? the jury would never know. she did not testify. the advice of her attorney said her families, and of cou