A 9 panel drug screen does not test for alcohol.
The 9 panel screen tests for amphetamines, cocaine, marijuana, opiates, PCP, barbituates, methadone, benzodiazepines and propoxyphene
Alcohol is metabolized at a rate of approximately 1 drink per hour. If you had also been tested for alcohol, it would be positive for approximately 16 hours (or, if metabolized a bit more slowly-24 hours). If the lab used EtG testing, this test could potentially be positive from 26 to 80 hours after last drink.
Again, a 9 panel screen does not include alcohol so you should be fine.
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