Your first clue would have been the fact that, from the shape of it's head, it's NOT a pit viper (i.e., Rattler, Copperhead, or Cottonmouth). Secondly, the coloring is a dead giveaway it's not a coral snake. On that basis, you could have concluded it was not a (U.S.) NATIVE venomous snake.
But, with the things people turn loose nowadays, ya never know !