Federal authorities say two reservations are among the main entry points for drugs into the United States.

As much as 20 percent of the high-potency marijuana grown in Canada comes through the St. Regis Mohawk Reservation, according to a 2010 report from the the National Drug Intelligence Center. And 5 to 10 percent of the marijuana produced in Mexico comes through the Tohono O'odham Nation, the report said.

"Multiple tons of high-potency marijuana are smuggled through the St. Regis Mohawk Reservation each week," the report said.

Regarding Tohono O'odham, the report said: "Drug traffickers exploit the vast stretches of remote, sparsely populated desert, the 75 miles of largely unprotected border with Mexico, and the highways that connect the reservation to major metropolitan areas to distribute illicit drugs in markets throughout the United States."

The report was released in February.

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Indian reservations on both U.S. borders become drug pipelines (McClatchy Newspapers 6/17)