Research shows Tasers can kill pigs / Wisconsin State Journal, 24 May 2006

http://www.madison.com/wsj/home/local/index.php?ntid=84995&ntpid=3
D.J. SLATER
"A controversial research project conducted by a UW- Madison professor showed that Tasers can kill pigs. John Webster, a professor of biomedical engineering at UW- Madison, recently discovered that it's possible for a Taser to cause ventricular fibrillation in pigs - a heart condition that will lead to death if not treated with electric defibrillation. However, since the Taser barb was placed only about 2 centimeters away from the pigs' hearts, research still hasn't shown if Tasers present a mortal danger to humans. Webster's experiment tested the distance between a Taser dart and 10 anesthetized pigs' hearts to see how close the dart must land to be lethal. "

CAN TASERS® DIRECTLY CAUSE VENTRICULAR FIBRILLATION?
PDF - http://www.engr.wisc.edu/bme/faculty/webster_john/EB2006Final.pdf