SI spoke with eight independent physiologists and biomechanics experts who had no involvement with testing Pistorius, and all eight agreed that Pistorius has abnormally low leg-swing times, stemming from the lightness of his prostheses. Four felt that Pistorius has an advantage over his competitors, while four said that the low swing time is an advantage but that there may be other potential disadvantages to the prostheses that must be studied in more detail before they could say if Pistorius should be allowed to race against intact runners. "It's innocent until proven guilty," Herr says.