Bloodstain pattern analysis allows forensic investigators to reconstruct events of a crime scene and to determine the approximate position of the victim as well as the direction of inflicted blows. The determination of bloodstain impact angles relies on trigonometric relationships, the calculations of which have been incorporated into a computer program called BackTrack. The program allows investigators to calculate the virtual flight paths of blood droplets in three-dimensional representations using digital photographs as data. The experiments carried out at the CPC involved the use of two mock crime scene bloodstain patterns, which were analyzed by BackTrack and rendered in three-dimensional representations for court presentation. In both cases, BackTrack was able to successfully determine the location of the blood source within 6 cm. The experiment also successfully incorporated virtual bloodstain projection strings into AutoCAD to show the virtual flight paths of blood droplets. Figures, table, references