Do You Need a Nanny Private Investigator?

Why some parents are spending big money to have their nannies followed on the job.
2:51 | 10/26/15

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Transcript for Do You Need a Nanny Private Investigator?
This morning, we're talking about a growing trend among parents. Checking out what's really going on when someone else is taking care of your kids. An investigation our reporter launched as there is increasing concerns from parents. Take a look. We're out, undercover. Discreetly following this nanny with a professional so-called nanny spy. But whey? Reporter: Caught on nanny cam, shaking a 1-year-old girl. Reporter: Time and time again, we see and hear real-life Horry stories of nannies behaving badly. Now families are shelling out big bucks for prooifrt investigators like Tom and Eddie. We're getting more calls now than ever before. You have to feel comfortable with this person who is basically joining your family as an outsider. Reporter: That is what this first-time mom is looking for. It's difficult to find somebody you can trust. Reporter: Our own Genevieve brown joined her on the search. Why did you decide to hire someone? I'm a first-time mom. The mum one reason I'm not back to work yet is because I'm nervous of who I'm going to leave him with. Reporter: We're not showing you the faces. P.I. Eddie goes undercover. He follows and video taps every move. What are some of the worst things you have seen in your practice? We see a lot of nanny distraction. Where nanny is not paying attention to the children. We have seen nannies leave children in strollers outside a store. Reporter: P.I.s are joining a rise in so called mommy spies. Moms keeping tabs on care givers. Like upper east side mamas. The mom who takes a picture and posts it, what motivates her to do it? She sees a child, sees something that's wrong, looks at her own child and says, if this was my nanny, I would want to know. Reporter: What did P.I. Eddie find? Once you left, she began her walk. Wind blew. She checked the comforter? Compared to what we have seen in the past, how zuz duz she rate? A 10. This is someone I would want to hire? Yes. Genevieve is here with me now. What shocked you most? After the background check, the references, the nanny cams, parents are still living in fear. Even though the vast majority of the the caretrarks good people. It does happen. What's the most important thing that parents can take away? The experts tell me, trust your gut. If you think something is wrong, 99% chance, something is wrong. Don't did I have those nanny cams just yet. People forget they're there. After awhile, the true behavior shines through. Trust you gut. Every mom knows that feeling. Thank you.

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

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