Compositions and methods useful for reducing or eliminating the presence of pathogens in meat and meat products are disclosed. Data defining a flow of fuel through the vehicle’s fuel injectors is combined with temporal data and GPS data to produce fuel use encoded GPS data that is transmitted to a remote computer. Adjusting the current flowing to the light source includes calculating a difference between the preset power value and the calculated power consumption of the light source, addingsubtracting the calculated difference value tofrom a preset current value to output a resultant value, and changing the voltage output to the light source according to the resultant output value.