Man dies after police use Taser device on him while breaking up fight in Maryland . Another man died in Canada last week after being shot with Taser gun . Comment: Taser International says many deaths involving stun guns have other causes .
Man dies after police use Taser device on him while breaking up fight in Maryland . Another man died in Canada last week after being shot with Taser gun . Amnesty International blames 150 deaths since 2001 on police stun guns . Taser International says many deaths involving stun guns have other causes .