The background check, references, and credit check will not reveal the child care providers personality or mood. You have to find that out the hard way or through the process of installing a hidden wireless camera especially if your children are very young and not able to explain themselves. Nanny cameras when your nanny leaves after you get home, you can put in the tape and watch the video to see what transpired while you were away from home. You may be shocked to see how the nanny spends the day or what she is doing to your child or children.