METHOD AND SYSTEM FOR DETERMINATION AND CLASSIFICATION OF INTOXICATING SUBSTANCE IN A BREATH SAMPLE FACILITATED BY A USER INTERACTION SCHEME

The present invention relates to a breath analyzing system and method. In particular the invention relates to a breath analyzing system and method arranged to provide tracer-aided determination and classification of the presence of a breath intoxicating substance facilitated by a user interaction scheme. If a determination may not be performed within a first compliant mode of operation an interactive mode is initiated wherein the user is stepwise instructed to perform actions that facilitate the classification. An action compliance value, representing how well the user follows issued actions/instructions, is determined and used to select actions.