If I had 75 people drink a 5th of Vodka and 25 peo

If I had 75 people drink a 5th of Vodka and 25 people drink water could you tell who was drunk without taking a Blood sample?.......The P trial results are visible results. Ya either still have it or ya don't......Now which arm works better(maybe) that's another ball game but you know If P works or not....and Leo knows...