According to a survey conducted by DNAinfo.com, of parents on the Upper East Side of New York, the majority of those who hired nannies never completed a background check before inviting a nanny into the home. References are an important part of the hiring process, but those interested in hiring a nanny should find a reputable company that can provide a complete background screening. Searches include a Social Security trace, address history, sex offender database, federal/statewide and county criminal record searches, motor vehicle report, education verification and reference verification. Some agencies also expand those searches to include employment verification, a search to check for any liens, bankruptcies or judgments, and even the Global Terrorist Watchlist. A great place to get started is the International Nanny Association.