[Tarpon]

Calderon said that 75,000 guns had been seized in Mexico in three years and 80 percent of those that could be traced came from the U.S.

Read this sentence first, very carefully, and you will see the whole propaganda line in a few words.

[a fool in paradise]

Also in the news:
Laredo border agents bust fake deputy, find (1000 pounds of) pot in truck
HOUSTON CHRONICLE ^ | June 1, 2010, 9:20PM | DANE SCHILLER
http://www.freerepublic.com/focus/f-news/2526305/posts

[MrB]

80% of the ones they already suspected were from US - ie, those without the serial numbers filed off, etc.

80% of those that they sent to be checked.

Of course, a majority of those you already have pre-selected are going to fit your assertion.