Muscle contraction during electro-muscular incapacitation: A comparison between square-wave pulses and the TASER(®) X26 Electronic control device

Abstract: Electronic control devices (including the Advanced TASER^® X26 model produced by TASER International) incapacitate individuals by causing muscle contractions. To provide information relevant to development of future potential devices, effects of monophasic square waves with different parameters were compared with those of the X26 electronic control device, using two animal models (frogs and swine). Pulse power, electrical pulse charge, pulse duration, and pulse repetition frequency affected muscle contraction. There was no difference in the charge required, between the square waveform and the X26 waveform, to cause approximately the same muscle‐contraction response (in terms of the strength‐duration curve). Thus, on the basis of these initial studies, the detailed shape of a waveform may not be important in terms of generating electro‐muscular incapacitation. More detailed studies, however, may be required to thoroughly test all potential waveforms to be considered for future use in ECDs.     

40‐Hz Square‐Wave Stimulation Requires Less Energy to Produce Muscle Contraction: Compared with the TASER® X26 Conducted Energy Weapon

Conducted energy weapons (CEWs) (including the Advanced TASER^® X26 model produced by TASER International, Inc.) incapacitate individuals by causing muscle contractions. In this study using anesthetized swine, the potential incapacitating effect of primarily monophasic, 19‐Hz voltage imposed by the commercial CEW was compared with the effect of voltages imposed by a laboratory device that created 40‐Hz square waves. Forces of muscle contraction were measured with the use of strain gauges. Stimulation with 40‐Hz square waves required less pulse energy than stimulation with the commercial CEW to produce similar muscle contraction. The square‐pulse stimulation, at the higher repetition rate, caused a more complete tetanus at a lower energy. Use of such a simple shape of waveform may be used to make future nonlethal weapon devices more efficient.     

Violence and the U.S. prohibitions of drugs and alcohol

This paper examines the relation between prohibitions and violence,using the historical behavior of the homicide rate in the UnitedStates. The results document that increases in enforcement ofdrug and alcohol prohibition have been associated with increasesin the homicide rate, and auxiliary evidence suggests this positivecorrelation reflects a causal effect of prohibition enforcementon homicide. Controlling for other potential determinants ofthe homicide rate does not alter the conclusion that drug andalcohol prohibition have substantially raised the homicide ratein the U.S. over much of the past 100 years.