No, read the results at exactly 2 mninutes by visually comparing the color of the reaction pad with the result chart on the package to determine the relative blood alcohol level. Do not interpret results after 3 minutes. Each human body reacts to alcohol differently, so sometimes when you feel sober there still might be traces of alcohol in your system, therefore, please make sure you wait for exactly 2 minutes. After 3 minutes the chemical reaction is not reliable.