Research & Education JFS ArticlesAAFS ConnectConference ProceedingsReference Series LibraryInternational Educational Outreach ProgramMethods and Materials Used in Steganographic “Invisible Ink” Communications in Prison FacilitiesPresenting section:Questioned Documents2021Adkins, Michael T., Washington DC; Harralson, Heidi H., Tucson AZ; Miller, Larry S., Johnson City TNView the paperQuestioned Documents