Craigslist Crackdown: Cops Go After Thieves

From puppies to motorcycles, thieves are selling your items on the Internet.
6:24 | 10/27/11

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Transcript for Craigslist Crackdown: Cops Go After Thieves
If you -- of the millions of people who shopped for bargains on Craig's list you've probably seen what looks like -- really great deals from. I've had two computer GPS device holiday incredible prices. -- you ever wonder why there's so cheap. It may be that the merchandise is stolen and police investigated you're about to meet might have their eyes on it too. Here's ABC's Neal Karlinsky. Inside this cramped office at the Portland police department -- shopping spree never ran. If you're thinking right about now this isn't your average burglaries -- your right. -- the price on the -- detectives spend their time jamming MC hammer and surfing the web. Sending text messages from disposable so called burger -- And sending emails from phony accounts leaving couples donors -- and makes -- a little and -- All part of one of the strangest shopping stories you'll find. -- you -- -- -- 16100000300. Dollar so when they're responding to ads on Craig's list for everything from computers to guitars motorcycles. I got a method the EU and here's -- -- Aren't right. Now alchemy and -- pictures that we do it. You name it they're looking for it but they're really only shopping for one thing bad guys unloading stolen merchandise -- attacked him and Craig's list is a booming marketplace were regular people make on this deals to sell every day things. But police say it's also become the pawn shop for stolen goods. Rather pot shops in Portland -- Well regulated -- -- they don't really have a time the property go -- autopsy more if there was sort of look and wears everything going prince was -- Craig's -- like the new -- The range of stolen items they've recovered is staggering we have Bob back GPS -- shall ring Droid cell phones. Baby strollers construction material. Old camera it. Craig's list -- -- like these -- just happening here but across the country kayaks in Florida Bulldog puppy. -- gates in Texas. This stings work like this at least -- the seller map out a place to do the body and warned victims. Not to get involved involve -- No circumstances. Ask him after anybody test. Right now they've got a meeting with a seller of a top of the line mountain bike they suspect is stolen and they're about to do this thing. The seller arrives with a spike but they don't let on right away first they make sure it's -- -- he's stolen by Roger were coming. It is. And detectives trying to decipher how this guy who goes by the name LT ended up with there was another virus have. -- -- -- But detectives can't prove that Alfie actually stolen -- they confiscate the body. And after a tough grilling they cut him loose. Relieved he's not going to jail -- a -- police say is no stranger to handcuffs tells us Craig's list -- that's thing that ever happened. It's Americans in every home business. Come on they're letting you off we could be honest here are these guys none of them think you didn't know you were dealing in stolen it's about a better homes and the numbers. -- -- -- -- It's insisted that should be able. Detective Steve Anderson and -- loss and -- they're unit grew out of an overwhelming demand. What He neared or broke case in point up or maliciously driven pair of new parents victims of a stolen B beast roller who set up the road meeting with a suspected thief. Even went so farmers to take this is video on their cell phone. -- -- -- -- -- -- This -- still baby strollers they put up flyers called around and found out their neighbors were hit too. And their strollers were all turning up on Craigslist. Too late but -- -- -- From people emailing me twining that I know it -- a lot more. Police are still on the case. Still their success rate is high more than a hundred duels in six months driving to their next case there's no mistaking it. -- -- A stolen trailer and a man had in his Stanley for a 35 years. Turned up for single and was -- perfect match when detectives arrived I walked up and within a matter ten seconds. To see all the different things from from the front attributed the back. Which says that's his trailer this time the victim mark -- -- reason they're just a few minutes later to make up positive identification. Got -- that you mentioned. -- -- The whole -- Things like that Seymour Whitaker told us he'd been checking Craigslist every week for five straight months to get to this point. I always figured -- business. -- -- -- the and try to make popular vote flipping the best place -- on Craig's list and you just spotted -- -- -- with this morning and before sundown. He got back -- But I don't Craig Wilson to -- -- The man who is trying to sell it is now a victim too He didn't know what was stolen when He bought it and now it's gone. I'm surprised they are pretty good sport I mean here it is you you know you're out 300 box. I've had -- really I mean people always stealing from other people unfortunately that's why added -- -- what would you say to those who sailed on him. And sprint small scale stuff we really need only detectives now oh recording guitars and hurtful. You have to go after the criminals but you have to go after worthy lines -- property. Because if they don't have an outlet to sell it. Then the don't have a way of making money so made -- discourage crime. When the music stops this shopping spree between cops and robbers isn't about deal. Sometimes it's about sending a victim home with its precious belongings. And letting the bad guys know that when it comes to -- their goods. -- I'm Neal Karlinsky for Nightline. In Portland Oregon.

This transcript has been automatically generated and may not be 100% accurate.

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