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Measuring a set of protein changes in the blood linked to alcohol use may potentially lead to a more accurate diagnostic test than those currently available, according to Penn State College of Medicine researchers. „The challenge in alcohol abuse as opposed to substance abuse — things like cocaine or heroin or PCP — is that alcohol is a perfectly legal substance for those over 21,“ said Willard M. Freeman, Ph.D., department of pharmacology and lead investigator. „Unlike routine testing for illicit drugs, you can’t just look for a trace of alcohol because many people enjoy a drink in a responsible manner and alcohol is very quickly metabolized. Discriminating between excessive and responsible levels of drinking makes this a greater challenge.“ (Source: Medical News Today, 3/25/10)