Strangling is a technique in many combat sports and self-defence systems. It is a method of winning a judo bout. Usually the opponent submits; if not, he is "strangled out", that is, the hold is continued until he passes out and is then immediately released. "Shime-waza", the judo term for this technique, has scored 97 times in World Judo events. No fatalities have resulted from it. There have been some deaths of suspects in police custody, where officers have used a "choke hold". Investigation suggested that this was because the officers' training had not been so adequate as the training of top-class judo players.