How long can a probation lab test for alcohol?

A probation lab test for alcohol can typically detect alcohol consumption for up to 24 hours after use through standard urine tests. However, more advanced tests, like hair follicle testing, can detect alcohol consumption over a longer period, up to 90 days. Blood tests can also show alcohol in the system for a few hours, while breathalyzer tests provide immediate results but are only effective for a short window. The specific detection window may vary based on factors like the individual's metabolism and the amount consumed.