Fishing and drinking?

So I have only been fishing avidly for roughly two years now (although I did fish on occasion as a child). Is it possible to drink beer while you fish? It seems EVERYWHERE I have fished has signs everywhere saying "no alcoholic beverages permitted." In movies, television, stories you hear, ect.., you always see/hear about people drinking beer while out on the lake fishing. I live in PA, so is there anywhere where that is possible?

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