Single Use, NF-Certified French Breathalyzer Kits
Blow into the bag with a full breath. Squeeze the bag through the yellow crystals. If the Crystals change colour you know you have alcohol left in your system. There is a line to act as an indication of what the legal limit in France is.
The Decree states that the breathalyzers MUST be listed in the “Official Journal of the French Republic” so you should only purchase NF-Approved Breathalyzer Kits if you want to be certain they will be accepted by the French Gendarme.