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The usual test for alcohol is actually a test for a metabolites of alcohol, called ethyl glucuronide, or EtG. While the EtG test is touted to be a test that will be positive for up to 80 hours, the reality is the vast majority of people will become negative between 24 and 48 hours.
If you are in a situation in which a positive test has dire consequences, you would be wise to avoid any alcohol intake for 80 hours before a test, if possible. But if an unanticipated test has come up, it is more realistic that you would usually become negative between 24 and 48 hours after drinking the beer.
If they are also performing a drug test, then the oxycodone and the diazepam may also be detected, but will not alter the time that the EtG will be detected. The oxycodone is not well detected by the generic opiate test, but the lab can do tests that will accurately detect the oxycodone.
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