From the Chicago Sun Times:
Drug cost gap puts heat on FDA
As more Americans buy cheap prescription drugs from Canada, the U.S. government is warning that these medicines might not work and could be dangerous. "Don't risk your health," a Food and Drug Administration brochure warns.

Yet, when FDA Associate Commissioner William Hubbard was asked during a congressional hearing how many times Canadian drugs have harmed American citizens, he responded, "I know of none."