In what appears to have been a gang-related dispute in Toronto yesterday, a girl was killed and six people were injured in a shootout in a crowded shopping center. Rather than blaming the individuals who did the shooting (or even gang violence), Toronto’s mayor blames guns. And above all, he blames the United States:

Mayor David Miller said almost every other type of crime is down in Toronto, but the supply of guns has increased and half come from the United States.
“The U.S. is exporting its problem of violence,” he said.

I’m not much of an expert on imports and exports.
However, Mayor Miller is right there on the scene, so obviously he knows more than I do about United States exports. If in fact we are exporting what he says we are, why not simply impose a huge tariff? Whenever guns or violence appear at the border, just tax them!
No, that wouldn’t work for guns, because they’re already subject to considerable regulation.
As the U.S. State Department points out, importing most firearms into Canada is severely restricted:

Prohibited Firearms
You cannot import prohibited firearms, or any prohibited weapons or devices, including silencers and replica firearms. A prohibited firearm is:
* a handgun with a barrel length of 105 mm (4.1 inches) or less;
* a handgun designed or adapted to discharge 25 or 32 caliber ammunition

All handguns which are not prohibited are restricted, and according to the State Department are subject to lengthy bureaucratic delays:

To be able to bring a restricted firearm to Canada in person, you will need to obtain an Authorization to Transport (ATT) from the CFO of the province where you will be entering Canada. If you are bringing firearms with you and declaring them with a Non-Resident Firearm Declaration, you will need to wait until your declaration has been confirmed, before you call the CFO to request an ATT.

I’m wondering whether any of the guns used in yesterday’s Toronto shooting were either prohibited or restricted. If they were brought in from the United States illegally, can it really be said that the U.S. “exported” them?
What I’d like to know is how we manage to “export violence” to a country with which we’re not even at war.
Well, more prominent minds than mine have argued that the United States exported homosexuality into a country we invaded.
Perhaps it’s no coincidence that “Brokeback Mountain” was unveiled to wide critical acclaim at the Toronto Film Festival last September.
Wow. I also see it was set for “wide release in Canada in December.” (The same month as the shooting!)
Case closed, I’d say.