Taser safety studies may be biased due to researchers' ties to the electrical stun guns' manufacturer, Taser International Inc., according to cardiologists at the University of California, San Francisco.

The cardiologists examined the the accuracy of 50 published studies on the potential dangers of using Taser stun guns and found that the likelihood of a study concluding the devices are safe was 75 percent higher when the studies were either funded by the manufacturer or written by authors connected with the company.