The on-camera shooting on Wednesday of two Virginia reporters has already reignited the debate over gun control in America. “I’m going to do something to shame legislators into doing something about closing loopholes and background checks and making sure crazy people don’t get guns,” Andy Parker, the father of slain WDBJ reporter Alison Parker, told Fox News.

Earlier efforts to push gun control legislation through Congress have failed. But Vox’s Zack Beauchamp describes a compelling case study for how another country has tackled the issue of gun violence. In the late 1990s, following a mass shooting, Australia launched a mandatory gun buy-back program. The government banned a number of types of guns, including automatic and semi-automatic rifles and shotguns, purchased guns from owners at fair market value, and offered amnesty for anyone turning in an illegally owned firearm. About 650,000 guns were seized and destroyed. Afterwards, Australia's murder and suicide rates dropped.

Could such a program work in America? Certain cities have already experimented with such an approach. The Los Angeles Police Department, for example, regularly holds buybacks and then melt down the guns. Cities in Florida, Connecticut, California, Arkansas, and Massachusetts also held gun buy-back initiatives in June this year, according to The Trace, a website dedicated to covering gun violence. More often than not, however, when police confiscate illegal guns or firearms found at crime scenes, they turn around and sell those weapons on the open market, raising quick cash for police supplies or training. Many states, including Kentucky, Texas, Tennessee, North Carolina, and Montana, have laws on the books that encourage or require local police to put the guns they collect each day back on the streets.

In theory, this would result in taking guns out of the hands of criminals and putting them into the hands of responsible, law-abiding gun owners. Thanks to the nation's patchwork of background check laws, however, it's very easy for guns to wind up in the hands of criminals (again). In many states, a straw purchaser with no criminal record could buy the weapon legally from a licensed dealer, then sell it, legally, in a private sale without requiring the buyer to undergo a background check. Let us not forget that Vester Lee Flanagan, the man who committed the horrific shooting in Virginia on Wednesday, obtained his gun legally.

The police practice of holding auctions or trading in guns to a dealer is legal under federal law, and in some states it's mandatory. The American Legislative Exchange Council (ALEC), a conservative network of lawmakers and corporations, and National Rifle Association both have their fingerprints on these laws advancing in Montana, North Carolina, and Tennessee. Here’s a small sampling of the widespread practice: