First Look at the Year-Long Investigation on Counterfeit Goods

From medicine to make-up and airbags, ABC News' David Muir unravels some of the fakes that could be hiding in places you never knew possible.
3:56 | 05/15/15

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Transcript for First Look at the Year-Long Investigation on Counterfeit Goods
We're back now with a first look at a year-long ABC news investigation into fakes. Counterfeit goods hiding in every corner of your home from medicine to makeup to air bags. Yes, there are people out there duping families into buying air bags that could harm you. David Muir is here with his investigation. It's a shocking story. The whole hour is shocking. There's an urgent effort under way to undercover counterfeit goods. This morning, we're revealing the tricks. Air bags. The family that knew they needed a replacement air bag when they bought a used car. So they bought one. But watch this. We're given access to secret facilities all over the country out the catch the fakes. Counterfeit goods that end up in every corner of your home. Even your driveway. Hi, David. We're the larsons. This is millimetermy, I'm bob. Reporter: The larsons reaching out to us. Standing in front of their used car, they bought it knowing they needed to replace the air bag. They didn't know hat the air bag they bought online was from this guy. The man who owned this home in Indian trailing North Carolina. Who tonight is behind bars. New details emerge in the case as the man accused of selling fake car parts. Reporter: Look what they found in igor's home. Fake air bags. He sold $1.7 million. Calling himself air bag pros. The larsons telling us federal investigators reached out to them. We found later the guy who sold us the driver's side air bag sold us a bum bag. Reporter: We offered to tow the larsons' car to a dealer to have their air bag replaced with an authorized air bag. We're about to test their air bag. First they set off a real air bag. Then the one in the larsons' car. Two, one. Wow. Shrapnel. You would have had a face full of plastic. We have a piece of the air bag cover over here. This is probably about 40 feet from the actual explosion of the air bag. Can you imagine this being in the driver's space of a car. Just unbelievable. You saw the Ebay seal, top seller. Tonight, they'll show the counterfeit crest toothpaste with anti-freeze in it. Counterfeit Mac makeup. Some of it hiding in plain sight. Check this out. You believe she's selling counterfeit prescription medication from here. Correct. Reporter: We're off. If we see a lady wearing a striped shirt with gray pants. She's right in front of us. Reporter: We dark across the parking lot. She's with me. Reporter: They find her. A push cart, a tiny mobile pharmacy. This is a prescription anti-inflammatory you can get for arthritis. I ask her if she's worried. She says no. Men with back, they're angry over what it did with them. They showed up with our cameras rolling. Are you in main? They were there to complain saying, what was in the medicine you gave us. Designed to protect you and heal you are kill sners. Everything shipped in is not watched over like tb the fda like med sip at your pharmacy. You can see more tonight opt a special "20/20," to catch a fake. 10:00 P.M., 9:00 central. David, amazing. Coming up next, Kris Jenner speaking out for the first time.

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

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