But Google said in 2004 it would continue carrying ads for Canadian pharmacies that send medicines to U.S. customers.

WSJ: Google Near DOJ Settlement Over Online Drug Ads

Rhode Island even has a law that goes into effect Jan. 15 that will license Canadian pharmacies to do business there.

FORBES: Spin Doctors

By 2003, big drug makers seeking to protect their U.S. sales shut online pharmacies out of the Canadian supply chain, forcing them to seek supplies elsewhere.

WSJ: How Fake Avastin Penetrated U.S. Doctors' Offices

Google said in February 2010 it would begin allowing ads only from U.S. pharmacies accredited by the National Association of Boards of Pharmacy and from online pharmacies in Canada that are accredited by the Canadian International Pharmacy Association.

WSJ: Google Near DOJ Settlement Over Online Drug Ads