Another objection frequently raised is that the jury will be unable to segregate the injuries caused by the initial impact from the injuries caused by the plaintiff's failure to fasten his seat belt. In addition to underestimating the abilities of those trained in the field of accident reconstruction, this argument fails to consider other instances in which the jury is permitted to apportion damages (i.e., as between an original tort-feasor and a physician who negligently treats the original injury). Furthermore, if the defendant is unable to show that the seat belt would have prevented some of the plaintiff's injuries, then the trial court ought not submit the issue to the jury.