To achieve their purposes, all death camps used subterfuge and misdirection to conceal the truth and trick their victims into cooperating. This element had been developed in "Aktion" T4, when disabled and handicapped people were taken away for "special treatment" by the SS from "Gekrat" wearing white laboratory coats, thus giving the process an air of medical authenticity. After supposedly being assessed, the unsuspecting T4 patients were transported to killing centres. The same euphemism "special treatment" ("Sonderbehandlung") was used in the Holocaust.