An injector device configured to mount to a predatory unmanned aerial vehicle (UAV) for non-destructively disabling and controlling a threat UAV comprises a rigid housing having a hollow interior. A controllable mount structure attaches the rigid housing to the predatory UAV and aligns the housing opening with the fuselage or payload of the threat UAV. A rigid penetrator rod disposed in the interior of the housing is configured to pierce the fuselage and hence payload of the threat UAV. A conduit coupled to the penetrator rod enables a disabling substance to be conveyed through the penetrator rod and into the payload of the threat UAV. An ejector propels the penetrator rod from the housing and into the payload of the threat UAV in response to a trigger when the threat UAV is within a predetermined range.