Robert O'Shea, an accident reconstruction expert, testified that he estimated the Congressman's speed to be 63 or 64 miles per hour at the time of impact, judging from details from the electronic data recorder of the Cadillac and "his own analysis". The State Highway Patrol investigator had said in testimony that he estimated Janklow's speed as "at least 70 mph". From his analysis, O'Shea said Scott's motorcycle's speed may have been as much as 65 mph; this was in contrast to the Highway Patrol's estimate of 59.