Now that they know where the deadly listeria-contaminated cantaloupe came from, federal officials are at the Colorado farm trying to determine the source of the bacteria.

FOX News Radio's Jennifer Keiper has the latest:

As the investigation into the deadly cantaloupe listeria continues, there's yet another tainted food recall.  On Thursday, it was eColi-infected ground beef.  Now, it's listeria-laced lettuce.

FOX News Radio's Sal Giangrasso has details:

Editor's Note: The recalled lettuce has a "Use By" date of 9/29.