The unthinkable is happening at facilities throughout the country: Vulnerable seniors are being raped and sexually abused by the very people paid to care for them. It's impossible to know just how many victims are out there. But through an exclusive analysis of state and federal data and interviews with experts, regulators and the families of victims, CNN has found that this little-discussed issue is more widespread than anyone would imagine. In cases reviewed by CNN, victims and their families were failed at every stage. Nursing homes were slow to investigate and report allegations because of a reluctance to believe the accusations - or a desire to hide them. Police viewed the claims as unlikely at the outset, dismissing potential victims because of failing memories or jumbled allegations. State regulators failed to flag patterns of repeated allegations against a single caregiver. It's these systemic failures that make it especially hard for victims to get justice - and even easier for perpetrators to get away with their crimes. Using inspection reports filed between 2013 and 2016 [a CNN analysis] found that the federal government has cited more than 1,000 nursing homes for mishandling or failing to prevent alleged cases of rape, sexual assault and sexual abuse at their facilities during this period. And nearly 100 of these facilities have been cited multiple times during the same period. These numbers likely represent only a fraction of the alleged sexual abuse incidents in nursing homes nationwide.