Stand your ground laws proliferate after Trayvon spotlight

The study found a national increase of up to 11% in homicide rates per month between 1999 and 2017 in those states with stand your ground laws. The largest increases, between 16% and 33%, were in southern states including Alabama, Florida, Georgia and Louisiana, the study found.

"These findings suggest that adoption of (stand your ground) laws across the U.S. was associated with increases in violent deaths, deaths that could potentially have been avoided," the study's authors concluded.

Advocates for the laws, especially the National Rifle Association, have argued they act as a crime deterrent by ensuring a person can protect themselves and others against a would-be assailant.

Florida was first in the nation in 2005 to adopt such a law. It was in force when Martin was fatally shot by self-appointed neighborhood watchman George Zimmerman on Feb. 26, 2012. Martin was Black; Zimmerman had a white father and Hispanic mother.

The initial police report said Zimmerman called authorities to report a suspicious person, a guy who, he said, "looks like he's up to no good." He followed Martin despite instructions not to do so. In the confrontation that followed, Zimmerman would tell authorities, Martin attacked him, forcing him to use his gun to save himself. Zimmerman was allowed to go free.

Martin's parents questioned Zimmerman's version of events and eventually the media and others picked up on the case. Zimmerman was arrested six weeks later after then-Florida Gov. Rick Scott appointed a special prosecutor to the case.

Zimmerman's lawyers opted not to pursue a stand your ground claim before trial, which could have resulted in dismissal of murder charges against him and immunity from prosecution. But the law was essentially used as his self-defense argument during the trial, which resulted in his acquittal.

Civil rights attorney Ben Crump, who was involved in the Martin case, called the Florida law "a virtual get-out-of-jail-free card that is essentially a license to kill."

Today the battle rages. Gun-rights supporters argue people should not have to try and retreat before defending themselves, said Alan Gottlieb, founder of the Second Amendment Foundation. He pointed to a Florida homeowner who recently shot and killed a man suspected of shooting a police officer as the man tried to break into his house. While that case could have been covered by other self-defense laws, Gottlieb said "stand your ground" laws offer reassurance.

"It's made a very big difference in in self-defense situations," he said.

Three new states passed laws last year removing the duty to retreat - Ohio, Arkansas and North Dakota, where its sponsor said the legislation "ensures someone will not have to run away prior to protecting themselves or their family."

Six more loosened requirements to carry guns in public by removing the requirement to get a permit, the largest number of any single year. More than 20 states now allow permit-less carry.

The U.S. Supreme Court also is expected to issue a ruling this session on whether New York's restrictive gun permitting law violates the Second Amendment right to "keep and bear arms." The law's defenders have said striking it down would lead to more guns on the streets of cities including New York and Los Angeles.

Gun control activists say the increasing presence of guns and laws like stand your ground are a deadly combination.

"Laws like stand your ground, or shoot first laws, give people like Jordan's killer, my son's killer, the idea that you can shoot first and ask questions later," said Rep. Lucy McBath, who entered politics after her son was slain at Florida gas station in 2012 by a white man who was angry over the loud music playing in the Black teenager's car. Michael Dunn used the "stand-your-ground" law in his defense, but was convicted and is serving a life sentence.

Likewise, Rovina Billingslea's family has never been the same. Her cousin Jasmine McAfee, a mother of two, was killed at the hands of an intimate partner near Orlando about four years ago. The shooter was later acquitted under "stand your ground" law, leaving her family reeling.

"There was no justice, no closure, just pain," Billingslea said.

There are new efforts to push back against the measures against a backdrop of rising gun violence: Lawmakers from 19 states have signed on to a new task force aimed at amending or repealing the laws, especially in Georgia, Kansas and Pennsylvania, as well as Florida. The push is backed by Everytown for Gun Safety and Moms Demand Action, whose founder Shannon Watts said they should be called "shoot first laws" since they differ significantly from other self-defense laws already on the books.

Since the Martin slaying, Florida has amended its stand-your-ground law to shift the burden of proof from the person claiming self-defense to the prosecutor handling the case.

Prosecutors and many police organizations have opposed the laws, contending they can protect criminals and hinder the ability to bring justice to fatal shootings.

"Stand your ground laws provide safe harbors for criminals and prevent prosecutors from bringing cases against those who claim self-defense after unnecessarily killing or injuring others," said David LaBahn, president and CEO of the Association of Prosecuting Attorneys, in testimony to Congress.

In Florida, an ongoing trial in which a retired police captain is accused of murder in the 2014 shooting of a man inside a movie theater hinged initially on a stand your ground claim. A judge denied that claim for the former captain, Curtis Reeves, and that was upheld on appeal.

Reeves, however, is still claiming self-defense in the killing of Chad Oulson following a dispute over Oulson's use of a cellphone during movie previews. The shooting happened after Oulson tossed a bag of popcorn at Reeves.

So far, that has not qualified as a stand-your-ground defense.

"The evidence will show that's no reason to kill another person," said Assistant State Attorney Scott Rosenwasser in an opening statement this week. "This was an intentional and purposeful shooting."

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Whitehurst reported from Salt Lake City.

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This story corrects the name of the journal. It is JAMA Network Open, not the Journal of the American Medical Association.