Abstract: A deadbolt control and security system for preventing rotation of a deadbolt manual egress handle of a deadbolt lock is described herein. The system preferably includes a deadbolt interface unit and at least one actuator unit. The deadbolt interface unit has a manual mode (the deadbolt interface unit manual egress handle controlling locking and unlocking the deadbolt lock) and a remote mode (the at least one actuator unit controlling locking and unlocking the deadbolt lock). The deadbolt interface unit includes: a deadbolt interface unit manual egress handle; a gear train having a shaft coordinated with the deadbolt interface unit manual egress handle; a unit-handle coupler that interfaces between the deadbolt manual egress handle and the deadbolt interface unit manual egress handle via the shaft; and a clutch. Preferred systems prevent the deadbolt lock from being unlocked using keys and/or other bypass tools.