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. If the user exceeds a predetermined reading from the substance detector, the vehicle is stopped from starting. Whether engine starting is allowed or disallowed, a message can be sent to the monitored ignition lock managing 
system.