Exsanguination occur. However, the animal's inverted position allows blood to flow more precipitously and thus makes an animal regaining consciousness before it is fully exsanguinated highly unlikely. In any case, animal welfare advisory councils clearly emphasize that the time from incapacitation to start of exsanguination should be prompt; recommending a time under 15 seconds. Beyond the initial cost of purchasing a captive bolt, continued usage of the method is very inexpensive. The animal is incapacitated for the duration of the procedure, so it is one of the safest methods for the slaughterer. Slaughter by exsanguination is mandated by Judaic kashrut (kosher)
Exsanguination since long been generally associated in public with this kind of slaughter cannot be registered..." and that "[a complete loss of consciousness] occurred generally within considerably less time than during the slaughter method after captive bolt stunning." In Islamic and Jewish law, captive bolts and other methods of pre-slaughter paralysis are generally not permissible, as consumption of animals found dead are regarded as carrion and stunned animals that are later killed will come into this category. Various halal food authorities have more recently permitted the use of a recently developed fail-safe system of head-only stunning using a mushroom shaped hammer