The present invention includes an apparatus and a method for testing exhaled breath
condensate for at least one biometric marker, including a substrate for collecting exhaled
breath condensate, the Substrate capable of being brought to a tem perature below a dew
point of vapor in exhaled breath, a collector for retaining the Substrate and for receiving a
bio metric marker reagent. The invention may further include receiving exhaled breath in a
collector, the collector compris ing a Substrate, the Substrate being at a temperature below a …