Step-by-step instructions on How to use the Alco-Screen.
https://www.rapiddetect.com/Alco-Scre...
A very easy-to-use method to positively identify the presence of alcohol in saliva for blood alcohol concentrations (BAC). Using a simple color chart, you will be able to determine a person's BAC ranging from 0.02% to 0.30%. It is highly suggested that for the most accurate results, do not place anything in the mouth for at least 15 minutes before to taking the test.