Device for measurement of breath alcohol, with a sample collector into which a breath sample can be introduced by the subject via a sample inlet , with a sensor which is arranged in a measuring unit of the device and to which part of the breath sample discharged into the sample inlet can be delivered, and wherein the measuring unit is designed to generate a measurement signal on the basis of an alcohol content contained in the breath sample, with a collector outlet via which the breath sample discharged into the sample collector is introducible into the measuring unit in which the sensor is arranged, and with a control and evaluation unit which is designed to determine the alcohol content of the breath sample on the basis of the measurement signal and to transmit a result-specific signal to an output unit , wherein the output unit is designed to provide information concerning the breath alcohol content of the breath sample, wherein the sample collector and the sample inlet are designed to be suitable for contactless introduction of the breath sample, wherein a main flow channel extending in the interior of the sample collector adjoins the sample inlet , wherein the device is designed such that, from the main flow channel , part of the breath sample discharged into the sample inlet acts at least temporarily on the sensor via a measuring gas channel , wherein the main flow channel , behind the measuring gas channel in the direction of flow, opens into the environment via an outlet , wherein at least one further outflow opening is provided between the sample inlet and the outlet of the main flow channel , wherein the device is designed in such a way that part of the breath sample introduced into the sample inlet emerges through the at least one further outflow opening into the environment , wherein the at least one further outflow opening is located between the sample inlet and the collector outlet , characterized in that the sample collector has at least one funnel-shaped retaining element which protrudes inwardly into the main flow channel and which ensures a nozzle-like guide for the respiratory gas stream in the main flow channel and is designed to at least partially impede a backflow of the breath sample in the direction of the sample inlet . with a control and evaluation unit which is designed to determine the alcohol content of the breath sample on the basis of the measurement signal and to transmit a result-specific signal to an output unit , wherein the output unit is designed to provide information concerning the breath alcohol content of the breath sample, wherein the sample collector and the sample inlet are designed to be suitable for contactless introduction of the breath sample, wherein a main flow channel extending in the interior of the sample collector adjoins the sample inlet , wherein the device is designed such that, from the main flow channel , part of the breath sample discharged into the sample inlet acts at least temporarily on the sensor via a measuring gas channel , wherein the main flow channel , behind the measuring gas channel in the direction of flow, opens into the environment via an outlet , wherein at least one further outflow opening is provided between the sample inlet and the outlet of the main flow channel , wherein the device is designed in such a way that part of the breath sample introduced into the sample inlet emerges through the at least one further outflow opening into the environment , wherein the at least one further outflow opening is located between the sample inlet and the collector outlet , characterized in that the sample collector has at least one funnel-shaped retaining element which protrudes inwardly into the main flow channel and which ensures a nozzle-like guide for the respiratory gas stream in the main flow channel and is designed to at least partially impede a backflow of the breath sample in the direction of the sample inlet . <EOS>