Patent ID: 8256286

Claim:
An apparatus for detecting and measuring ethyl alcohol in the bloodstream comprising: an array of sensors adapted to process the pre-perspiratory vapor emanating from a person, the pre-perspiratory vapor containing one or more analytes; each sensor in the array of sensors producing a signal in response to the analytes present; at least one sensor producing an identifiable signal to an analyte of ethanol; and at least two sensors in the sensor array producing a respective signal in response to an identical analyte, the signal output by a first of the at least two sensors having a predetermined difference from the signal output by a second of the at least two sensors; a pattern recognition library storing signal patterns corresponding to one or more outputs of the array of sensors; and a computing device receiving individual outputs from the array of sensors, the individual outputs exhibiting a pattern, including the predetermined difference, and comparing the pattern formed by the individual outputs to the signal patterns stored in the pattern recognition library, and determining a transdermal alcohol content measurement as a function of the comparison.