A lawsuit filed Monday in the September death of a 21-year-old man whom Vallejo police repeatedly shocked with a stun gun accuses manufacturer Taser International of knowingly marketing a dangerously defective weapon as safe and "non-lethal."
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But medical experts say Taser ignores established medical evidence that shows that people intoxicated with drugs and people who are fleeing have heightened levels of adrenaline in their systems and may be more vulnerable to having their heart rhythms disrupted by a Taser shock. This could trigger a potentially fatal chaotic state known as ventricular fibrillation, causing cardiac arrest.
"I've seen the Taser folks say, 'Oh, the guy had cocaine in his system, that's the reason for his death,' '' said Dr. Zian Tseng, a cardiologist and electrophysiologist at UCSF who specializes in heart-rhythm disorders. "Well, someone with cocaine in their system is also much more prone to a Taser- induced cardiac arrest.''
"They cannot say that it's safe in my opinion,'' he added.
Taser says company studies where researchers shock anesthetized pigs confirm the stun gun can't trigger erratic heart beats. Tseng said knocked-out pigs won't have the same panicked adrenaline response of a suspect clashing with police.
"So what can you say: It was safe on anesthetized pigs," Tseng added. "It's far from a real world test.''
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