WEBVTT 00:01.533 --> 00:03.900 align:left position:20%,start line:77% size:70% JUDY WOODRUFF: Now back to Sunday's massacre in a Texas church. 00:03.900 --> 00:08.766 align:left position:10%,start line:71% size:80% As we reported, the killer's past behavior should have legally blocked him from purchasing 00:09.933 --> 00:12.266 align:left position:20%,start line:83% size:70% the guns he used to kill 26 people. 00:12.266 --> 00:17.266 align:left position:20%,start line:71% size:70% Our nation's gun laws are a patchwork, varying from state to state, and requiring the diligence 00:18.366 --> 00:20.900 align:left position:20%,start line:83% size:70% of many different agencies and officials. 00:20.900 --> 00:25.100 align:left position:10%,start line:77% size:80% William Brangham is back with a explanation of this complicated legal landscape. 00:25.100 --> 00:29.100 align:left position:10%,start line:77% size:80% WILLIAM BRANGHAM: In the United States, the settlement gives citizens entered right to 00:29.100 --> 00:30.533 align:left position:20%,start line:89% size:70% keep and bear arms. 00:30.533 --> 00:33.866 align:left position:10%,start line:83% size:80% The Supreme Court has several times affirm this fact. 00:33.866 --> 00:38.366 align:left position:20%,start line:77% size:70% But there are some legal restrictions on who can purchase or keep guns. 00:38.366 --> 00:42.466 align:left position:10%,start line:77% size:80% Under federal law, to buy a gun from a licensed dealer, you have to be a U.S. citizen and 00:42.466 --> 00:47.100 align:left position:10%,start line:83% size:80% at least 21 to get handgun or 18 for a rifle or shotgun. 00:47.100 --> 00:50.800 align:left position:10%,start line:77% size:80% Retailers also have to run your through the National Instant Criminal Background Check 00:50.800 --> 00:52.866 align:left position:40%,start line:89% size:50% System. 00:52.866 --> 00:56.300 align:left position:10%,start line:77% size:80% Federal and some state laws designate four main categories that restrict your ability 00:56.300 --> 01:01.300 align:left position:10%,start line:71% size:80% to get a gun: committing a violent or gun-related crime, having a diagnosed mental illness, 01:03.300 --> 01:07.033 align:left position:10%,start line:77% size:80% known drug or alcohol abuse, or crimes committed when you were a juvenile. 01:07.033 --> 01:10.200 align:left position:20%,start line:77% size:70% These are all things that would show up in that background check. 01:10.200 --> 01:14.700 align:left position:10%,start line:77% size:80% These restrictions might seem obvious, but not every state has these rules, and not every 01:14.700 --> 01:17.033 align:left position:20%,start line:83% size:70% state enforces the laws in the same way. 01:17.033 --> 01:21.366 align:left position:10%,start line:77% size:80% For example, in 23 states and Washington, D.C., you can't have a gun if you have been 01:21.366 --> 01:24.066 align:left position:20%,start line:83% size:70% convicted of a violent or gun-related crime. 01:24.066 --> 01:27.866 align:left position:10%,start line:77% size:80% The killer in Texas, Devin Kelley, should have been blocked from buying a gun because 01:27.866 --> 01:32.866 align:left position:10%,start line:77% size:80% he violently abused his wife and her toddler several years ago when he was in the Air Force. 01:34.833 --> 01:38.566 align:left position:10%,start line:77% size:80% A 1996 federal law bars domestic abusers from buying gun, but, as we mentioned before, the 01:40.033 --> 01:42.433 align:left position:10%,start line:83% size:80% Air Force didn't report his record to other authorities. 01:42.433 --> 01:46.700 align:left position:10%,start line:77% size:80% On the issue of mental illness, a majority of states and D.C. bar people with a history 01:46.700 --> 01:49.700 align:left position:20%,start line:83% size:70% of mental problems from accessing firearms. 01:49.700 --> 01:51.700 align:left position:10%,start line:89% size:80% But it's by no means foolproof. 01:51.700 --> 01:54.866 align:left position:10%,start line:77% size:80% The great majority of people suffering from mental illness are not violent. 01:54.866 --> 01:57.033 align:left position:20%,start line:83% size:70% So, who determines who is a threat? 01:57.033 --> 02:01.333 align:left position:10%,start line:77% size:80% Sometimes, an individual will be flagged by the legal system or by a mental health provider, 02:01.333 --> 02:06.233 align:left position:20%,start line:77% size:70% but, often, reporting it to federal and state databases never happens. 02:06.233 --> 02:09.900 align:left position:10%,start line:77% size:80% On the issue of drug abuse, if you're known to authorities to abuse drugs or have been 02:09.900 --> 02:14.900 align:left position:10%,start line:77% size:80% convicted of a drug-related crime, 28 states and Washington, D.C., will block your access 02:15.500 --> 02:17.466 align:left position:30%,start line:89% size:60% to a firearm. 02:17.466 --> 02:20.266 align:left position:10%,start line:77% size:80% The same goes for alcohol in 18 states and the District of Columbia. 02:20.266 --> 02:25.266 align:left position:10%,start line:71% size:80% And with each of these restrictions, a handful of states only block people from having handguns, 02:26.000 --> 02:28.533 align:left position:20%,start line:89% size:70% not shotguns or rifles. 02:28.533 --> 02:33.066 align:left position:10%,start line:71% size:80% Of course, people can often bypass state and federal rules entirely simply by buying firearms 02:34.233 --> 02:36.400 align:left position:20%,start line:83% size:70% from private sellers, often at gun shows. 02:36.400 --> 02:41.400 align:left position:10%,start line:77% size:80% Those sales from one private citizen to another are largely exempt from any reporting rules. 02:42.566 --> 02:44.633 align:left position:20%,start line:83% size:70% This is what's known as the gun show loophole. 02:44.633 --> 02:48.566 align:left position:10%,start line:77% size:80% It's estimated that almost a quarter of all guns are bought this way, with no background 02:48.566 --> 02:50.633 align:left position:30%,start line:89% size:60% checks at all. 02:50.633 --> 02:55.333 align:left position:10%,start line:77% size:80% Another loophole, there is no federal system for removing firearms if a person later falls 02:55.333 --> 02:57.866 align:left position:20%,start line:83% size:70% into one of these prohibited categories. 02:57.866 --> 03:02.433 align:left position:10%,start line:71% size:80% So if you bought a gun legally, but then developed mental illness or commit a violent act or 03:02.433 --> 03:07.166 align:left position:10%,start line:77% size:80% abuse drugs, it's nearly impossible for authorities to take those guns back. 03:07.166 --> 03:12.100 align:left position:10%,start line:77% size:80% So here's a crucial question: Do any of these laws actually make a difference in reducing 03:12.100 --> 03:13.300 align:left position:30%,start line:89% size:60% gun deaths? 03:13.300 --> 03:15.766 align:left position:20%,start line:83% size:70% Do they make us safer as a society? 03:15.766 --> 03:20.200 align:left position:10%,start line:77% size:80% According to one analysis done by the Law Center to Prevent Gun Violence -- that's the 03:20.200 --> 03:24.900 align:left position:10%,start line:77% size:80% group associated with former Congresswoman and gun control advocate Gabby Giffords -- the 03:24.900 --> 03:27.266 align:left position:20%,start line:89% size:70% answer is clearly yes. 03:27.266 --> 03:32.266 align:left position:10%,start line:77% size:80% The center graded all 50 states from A through an F on how they enact and enforce gun laws 03:33.833 --> 03:37.033 align:left position:20%,start line:77% size:70% and then compared those grades to actual gun deaths in each state. 03:37.033 --> 03:42.033 align:left position:20%,start line:71% size:70% They conclude -- quote -- "States with stronger laws have fewer gun deaths per capita, while 03:43.200 --> 03:45.833 align:left position:20%,start line:83% size:70% states with weaker laws have more gun deaths." 03:45.833 --> 03:49.000 align:left position:20%,start line:77% size:70% Many gun rights group take strong issue with this kind of analysis. 03:49.000 --> 03:54.000 align:left position:20%,start line:71% size:70% They argue that fewer restrictions and more gun ownership is the way to better public 03:54.500 --> 03:55.766 align:left position:40%,start line:89% size:50% safety. 03:55.766 --> 03:56.500 align:left position:20%,start line:83% size:70% For the "PBS NewsHour," I'm William Brangham.