Abstract: A system for disabling robbers has an ejector arranged for projecting needle-like discrete articles across a passageway which a robber must traverse during flight, and toward a receptor disposed opposite of and spaced from the ejector across the passageway. Articles which do not strike the body of the robber will be received by the receptor. A tranquilizer is provided on the articles for rendering the robber unconscious in seconds. Personnel inside the building subjected to robbery can activate the system, either directly as the robber attempts to leave the building, or indirectly by actuating a sensor system when the robbery is first instigated.