Abstract: A monitored ignition system is provided. A monitored ignition lock unit is contained within a vehicle. The monitored ignition lock unit is in communication with a weight sensor in the driver's seat and a seatbelt detection feature of the vehicle. A monitored ignition lock managing system is contained remotely from the vehicle. The monitored ignition lock and the unit monitored ignition lock managing system are in wireless communication. The monitored ignition lock unit includes a handheld device and a receiving station. The handheld device includes a substance detector, such as a breathalyzer. A camera is aimed to photograph a user when engaged with the substance detector. The handheld device and the receiving station are connected via a tether. The tether is sized such that only a driver sitting relatively close to the monitored ignition lock unit docking can access the substance detector provided in the monitored ignition lock handheld device.