This article from the FBI Law Enforcement Bulletin discusses a process that allows victims of sexual violence to file anonymous or confidential reports (being labeled as blind reports). Blind Reporting of Sexual Violence [1]
Links:[1] http://www.fbi.gov/publications/leb/1999/jun99leb.pdf [2] http://www.nsvrc.org/publications/legal/privacy [3] http://www.nsvrc.org/publications/reports