Each quick and easy to use test strip allows you to perform a quantitative alcohol in saliva test. The alcohol test strips for saliva will only detect recent alcohol use, where alcohol is still in the blood at above the level that the test strip detects.
If you want to detect more historic alcohol use over the last 72 hours you would need to use the ETG URINE DIP CARD which measure metabolites of alcohol in urine.
The test strips is a rapid, highly sensitive test for the determination of relative blood alcohol concentration in saliva specimens. The alcohol tests strip can also be used to test for the presence of alcohol in any liquid.