Abstract: A system for determining a blood alcohol concentration of an individual includes one or more sensors configured to measure a physiological parameter of an individual, and an analysis unit, and a method for monitoring a state of a driver related thereto. A system for determining a blood alcohol concentration of an individual can include one or more sensors, and an analysis unit configured to receive one or more outputs of the one or more sensors. The one or more sensors are configured to measure a physiological parameter of an individual, and the analysis unit is configured to determine a mental state or a physical state of the individual based on the one or more outputs of the one or more sensors.

Abstract: A wearable device including multiple sensors, a memory, a processor coupled to the memory and the multiple processors, and executable code stored in the memory. When executed by the processor, the executable code causes the processor to receive data from at least some of the multiple sensors, the data indicating physical activity of a wearer of the wearable device, food consumption of the wearer, and sleeping habits of the wearer and determine an estimated stress level of the wearer based on the physical activity of the wearer, the food consumption of the wearer, and the sleeping habits of the wearer.