telescope sighting devices, grenades, grenade launchers and high-powered ammunition, such as the so-called cop-killer bullets believed to be able to penetrate bulletproof vests.
That's your basic 30-06 Winchester model 70 for you.
The weapons are often bought legally at gun shows in Arizona and other border states where loopholes allow criminals to stock up without background checks.
False, the loophole doesn't make it legal, it just means no check for face-to-face, something that is not restricted to gunshows.
Mexico is a rich market for smugglers because it bans high-caliber automatic weapons -- even police are prohibited from using them -- and has strict gun laws that make it extremely difficult for members of the public to buy handguns
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Outside the office of Zatara¿n Cedano, the Tijuana police director, a man always stands guard with an AR-15 rifle.
EVEN THE MEXICAN POLICE ACTIVELY AND CONTINUALLY BREAK THE LAW!
It is illegal for even the police to have "high-caliber automatic weapons" which is what this journalist would brand that AR-15, be it select fire or not, were it in the hands of a criminal. There is a chance of course that the writer knew his termenology and chose automatic, meaning fully automatic/burst rather than semi automatic, and hoping the reader does not (because a story about how criminals from one country smuggle something into another country when it is illegal in both usually is followed by a call for more border enforcement, not calls to make unrelated items also illegal)
However, in general media parlance, semiautomatic IS automatic, and judging by the amount of corruption in the Mexican government, I wouldn't put it past the Mexican Police to get illegal guns themselves. Hell, that police officer with the AR-15 is probably going to 'loose' the gun for a $500 bribe next month, and then they will go borrow another AR-15 from the military or get one sent to replace it on the government dime again.
I have heard that handguns in mexico come from two places, smuggled in from the US, and police officers selling their duty weapon then claiming it was stolen.
That is the real problem, not guns, but a government rife with corruption. You know what Mexico needs? More guns. One rifle in the hands of every citizen, and then they can drive every member of the government, every person who draws a government paycheck, into the sea.