Texas' "Castle Doctrine" allows residents to use deadly force to protect themselves from attackers in the home, with no duty to retreat. But a top prosecutor in Bexar County opposes the doctrine and said it makes prosecution difficult. "When we take away the duty to retreat, we make it a situation that encourages violence, not discourages it," First Assistant District Attorney Cliff Herberg said Thursday night at a forum. Herberg said Gov. Rick Perry explained it best in a conversation several years ago when he called it "a solution without a problem." When such laws were passed, their proponents could not demonstrate a single case where the wrong person had been prosecuted, Herberg said. In Florida, where Trayvon Martin was recently shot to death, the Stand Your Ground law also does not include a duty to retreat. As it stands in Texas, the doctrine protects people who use force in their homes, along with vehicles, workplaces or any place where a crime could occur. But Albert Kauffman, an associate professor of law, said a Houston legislator might introduce a bill to limit the doctrine's protection to the home.