It allows the detection of ethyl glucuronide, or "EtG".
EtG is the main biomarker when it comes to highlight alcohol consumption, as this is a major metabolite of the ethanol contained in alcoholic beverages.
The urine test will be particularly useful in situations where alcohol consumption is absolutely prohibited, as in a medically supervised withdrawal, or in some professional environments that require total abstinence for safety reasons (eg in transport, or petrochemical fields).
This test is a qualitative assay (type "NO / YES"), and thus delivers a "NEGATIVE" or "POSITIVE" result.