From Adderall to Xanax, It's All for Sale Online

"What's happening now with the Internet is that it's almost flipped," Liga said. "We have people who never dreamed of using heroin or cocaine, but they have no problem taking an Adderall."

Impossible to Trace

Law enforcement agencies now face the daunting task of taking down dealers who are almost impossible to trace, because they conduct their business and then disappear into cyberspace.

In just a few years, the number of Web sites selling potentially dangerous drugs without a prescription has increased exponentially. Right now, you can buy drugs like OxyContin, Vicodin, and Xanax with your credit card from more than 1,000 Web sites and have them delivered directly to your door. And they are the real thing.

So how easy is it to get to one of these sites? Do you have to be a savvy insider? Drug Enforcement Administration agent Tim Stover took "Nightline" on a tour of the Internet-based drug world.

Agent Stover started with a simple Web search of "no prescription hydrocodon," which quickly yielded 141,000 listings. He then demonstrated how easy it was to submit an order. After selecting the drugs he wanted to purchase, he was asked to answer 10 simple questions and was then asked to submit his credit card information.

"From the time that we put our answers in here we've had drugs that we've ordered -- at 2 o'clock in the afternoon on a Thursday -- delivered to us at 10 a.m. on Friday," said Stover. "So it's a very quick, very efficient process."

It's as easy as ordering a book online: Prescription-strength drugs are available without a prescription. All you need is a credit card and a craving. And you don't even have to muster the courage to deal with someone face to face who may want to hurt you.

"It's all done from the comfort of your home," explained Stover, "and ... the anonymity of the Internet."

In other words, you can potentially buy these drugs online without ever exposing who you really are. And aggressive advertising in the form of pop-ups, cookies and mass e-mails means you don't even have to search for the Web sites online; they will come to you.