Pot Smugglers Prefer Postal Service

Pot traffickers are increasingly realizing that there's no need to risk hauling their drugs across the country—they can just have the US Postal Service do it for them. Seizures of marijuana by postal inspectors have increased 400% since 2007. More than 3,600 packages with marijuana were found in 2009, leading to about 1,300 arrests. The drug is often concealed in ordinary objects, like cans of food, microwaves, and computer towers.

"There is no better way to ship drugs right now," San Diego's police chief tells ABC News. "It's going up all the time." (More marijuana stories.)