In this photo taken Wednesday, Jan. 20, 2010, Fresno County Sheriff's Lt. Rick Ko walks through a camp site at an abandoned marijuana growing site in the Sequioa National Forest near Fresno, Calif. With billions of dollars in drug profits on the line, Mexican traffickers are expanding their foothold in the domestic marijuana market taking over vast swaths of public lands. (AP Photo/Rich Pedroncelli)
Read the article: Drug gangs take over U.S. lands
