A system includes a laser beam generating device that transmits a wireless first signal, having a first monochromatic radiation level, toward the driver. The first signal bounces off the driver and returns a second signal towards the acetaldehyde level detecting mechanism. A radiation intensity level of the second signal, having a second monochromatic radiation level, is analyzed for determining the driver's blood acetaldehyde level. A mechanism is included for detecting a level of acetaldehyde in a driver's blood stream, which is located within a law enforcement vehicle. A mechanism is included for visually displaying the acetaldehyde level so that the officer can determine whether a threshold level is exceeded. The visually displaying mechanism includes a monitor including a graphical user interface. A mechanism is included for monitoring a location of the vehicle driver so that the officer can track and apprehend the driver.