"The objective facts must indicate that the suspect poses an immediate threat to the officer or a member of the public," Judge Kim Wardlaw said in the 3-0 ruling.
Though stun guns may offer a valuable, nonlethal alternative to deadly force in defusing dangerous situations, Wardlaw said, they inflict a "painful and frightening blow" and must be used only when substantial force is necessary and other options are unavailable.
"It's a significant use of force, not like cuffing someone or using pain compliance or pepper spray," said Eugene Iredale, a lawyer for a San Diego-area man who was Tasered by a police officer who had stopped him for not wearing a seat belt. "It's not to be used promiscuously or lightly."
The ruling allows Iredale's client Carl Bryan to go to trial in his damage suit against Brian McPherson, a policeman in Bryan's hometown of Coronado. McPherson's lawyers were unavailable for comment.
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