Sobriety testing apparatus having OBD-II connection capability

A sobriety interlock for a machine comprising:

• an alcohol detection device capable of detecting alcohol in a sample human breath provided by an operator and capable of generating a signal proportional to a breath alcohol concentration of the breath sample;
• a computing device electrically connected to the alcohol detection device, the computing device capable of calculating a blood alcohol concentration of the operator based on the breath alcohol concentration;
• a first electronic circuit electrically connected to the computing device, the electronic circuit capable of controlling operation of the machine based on the blood alcohol concentration determined by the computing device;
• and
• a second electronic circuit capable of connecting the computing device to an on-board diagnostic port on the machine, the on-board diagnostic port providing tamper—resistant power and data to the computing device and independently providing an interface for interfacing with external diagnostic equipment.

A method of gathering data related to the sobriety of an operator of a machine, the method comprising the steps of:

• sampling the breath of the operator with an alcohol detection electrically connected to a computing device;
• determining the alcohol concentration of the breath with an on-board computing device;
• receiving machine operation data through an on-board diagnostic port on the machine, the diagnostic port providing an independent interface to diagnostic equipment;
• providing secure power to the on-board computing device from the diagnostic port;
• and
• storing the machine operation data.