A new report by the National Center on Addiction and Substance Abuse at Columbia University (CASA) underscores the results of other recent online pharmacy studies — showing that’s it’s too easy to buy prescription drugs, including controlled substances, without a prescription online.

Only 15 percent of 365 sites examined in the study required a prescription. According to Reuters, CASA recommends that the United States negotiate treaties with other governments to shut down illegal Internet trafficking of prescription drugs.

In April, the U.S. Senate passed a bill that included tougher regulation for online pharmacies — but the legislation is still awaiting action in the House.

You can download the CASA report here.

And if you’re looking for a legitimate, online and mail-order pharmacies, check out eDrugSearch.com’s prescreened list of safe licensed Canadian pharmacies.

Here’s a CBS News report based on the CASA study: