The shooting at Marjory Stoneman Douglas High School in Parkland, Florida, sparked a national debate about gun control. However, the Trump administration doesn’t have the best track record on sharing reliable information about guns.

In April 2017, education secretary Betsy DeVos said schools in Wyoming “probably” kept guns on campus to protect students against bears, but local officials said they use fences and bear spray because weapons are banned from elementary, middle, and high school campuses. Even President Donald Trump’s recent tweet claiming “gun free zones are proven targets for killers” is highly debatable.

Trump has repeatedly pointed to a research by gun-rights advocate John Lott as the source of this claim, but experts have said Lott's research is flawed, citing differing definitions of what constitutes a "gun-free zone" (Lott defined it as a place where private citizens aren't allowed to carry guns, not a place with no guns present) and how "mass shooting" is defined. Additionally, Louis Klarevas, a professor at the University of Massachusetts, Boston, argued in his book “Rampage Nation” that, based on his data, 84% of mass shootings happened in places where civilians are allowed to carry guns.

Gun control is clearly a complex and controversial issue. So we teamed up with PolitiFact to unravel the truth behind the Trump administration’s biggest lies about guns:

1. Trump promotes the myth that good guys with guns are the answer to mass shootings.

On February 28, Trump hosted a televised meeting with bipartisan lawmakers to discuss the issue. He made several false claims, even praising Texas for not having “this problem” with mass shootings, despite the fact that in November a gunman killed 26 people at a church in Sutherland Springs, the New York Times pointed out. This was merely one example — one that happened during Trump’s presidency, no less — out of many recent mass shootings in Texas.

Trump also falsely claimed a good guy with a gun could have prevented the Pulse nightclub shooting in 2016. The reality is an off-duty police officer was at the club that night in Florida. He exchanged fire with the terrorist. Despite the officer’s training and bravery, he was not able to prevent the slaughter of 49 people.

2. Trump falsely claims that the city of Chicago is proof that tough gun laws don’t work.

In November 2017, Trump dismissed the idea that stricter regulations could reduce gun violence by saying: "You look at the city with the strongest gun laws in our nation, is Chicago, and Chicago is a disaster.” His administration routinely promotes this false narrative. Trump tweeted this opinion in 2014, then made the same incorrect point during a campaign debate with Hillary Clinton in 2016.

The problem is the claim that Chicago has the toughest gun laws in the nation. Gun owners in Chicago have been able to carry a concealed weapon since 2013, and it is still more difficult to get a similar permit in places like New York. On the state level, a pro-gun-control group called the Law Center to Prevent Gun Violence ranked seven states as having tougher gun laws than Illinois, including New York, Massachusetts, Connecticut, New Jersey, Maryland, California and Hawaii.

"We generally think of California as having the strongest gun laws in the country," Hannah Shearer, an attorney at the LCPGV, told NPR.

In fact, according to PolitiFact, the LCPGV says Illinois’s firearm laws could be tightened in several ways: The state could require the safe storage of guns at home, allow police more leeway in denying concealed-carry permits, and let local jurisdictions pass regulations. Regardless, White House press secretary Sarah Huckabee Sanders repeated Trump’s myth in October 2017. “If you look to Chicago, where you had over 4,000 victims of gun-related crimes last year, they have the strictest gun laws in the country. That certainly hasn’t helped there," Sanders said during a press conference. "We have to look at things that may actually have a real impact."

Defining policy that has “real impact” can be very subjective. However, holding Chicago up as an example doesn’t prove that strict gun laws are inadequate. When it comes to issues like concealed-carry permits, Chicago actually has less authority to enforce limitations than many other American cities. PolitiFact has deemed this idea “intellectually lazy” at best and a “deliberate attempt to mislead” at worst. A review of more than 130 studies from 10 countries, published in 2016 by the Epidemiologic Reviews, found that in certain nations, gun control laws correlated with a reduction in gun-related deaths.

Related: Donald Trump’s Biggest Lies Since the 2016 Election

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