Can you? Yes. Should you? No. Call 911. Just tell the Police that he drank the listerine rather than you giving it to him. And if he doesn't go for it and blames you, would you rather be in trouble for a little while or have no brother at all? Ps- next time he wants to get drunk, just give him a screwdriver (the drink) and fill up the vodka bottle depending on how much you took with water. Don't be stupid and give him something meant to kill bacteria... It can kill him.