The dangers of hiring a nanny or caregiver without first completing a nanny background check can include everything from theft to physical harm and anything in between. One mother wrote an article for parenting.com in 2015, documenting her experience when she did not complete a background check. The nanny, hired through Craigslist, later was found to have a history of writing bad checks and had several arrests from her early 20s. in another situation in 2014, a California nanny who was hired online later physically abused the twins she was expected to care for. Each of these situations could have been avoided had a proper background check been completed prior to hire.