Alcohol Monitoring Systems, Inc.

Royce Alan McDonald

Jeffrey Scott Hawthorne

Michael Leonard Iiams

Mark Wojcik

Gordon William Murray

Ben Franklin Houston

Charles Thomas Champion

An improvement in monitoring alcohol levels through transdermal testing is provided by detecting if environmental gasses, referred to as interferents, have been introduced into a transdermal vapor sample. An insensible skin perspiration sample may not be completely controlled and can contain interferents from an environmental source rather than the subject. Before testing a skin perspiration sample, the alcohol sensor is sampled and averaged to establish a baseline value. A sample is drawn and presented to the alcohol sensor. The output of the alcohol sensor is monitored to determine the amount of alcohol in the sample. A maximum alcohol sensor value for the transdermal alcohol monitor is set by determining the baseline value when no alcohol is present in the sample. Subsequent baseline values during a reading above the maximum alcohol sensor value indicate that an environmental interferent is present in the alcohol sensor.

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Northglenn, CO, United States of America

Royce Alan McDonald