@Grateful Dude I found some info from FWC (Florida Fish and Wildlife Commission) on the coral snake as well as how to distinguish most venomous snakes from non-venomous ones:
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Most potent venom ?
With the Western Diamondback rattlers, the eyes/pupils and the pits are very east to spot. The head shape is different too (usually), venomous snakes have a more triangular shape while non-venomous are more rounded. But there are exceptions - like coral snakes don't have a triangular head, and some non-venomous snakes can flatten their head to look triangular.
I just read that only the Black Mamba is the only snake with a more powerful venom. But corals don't really strike a pit viper, the bite and chew while releasing venom. A coral snake bite can disrupt the connections between the brain and muscles, resulting in slurred speech, double vision, and respiratory paralysis.
You may also find this interesting:
Antivenin is scarce and enormously costly - the only American manufacturer ceased production on 2003, and a finite amount of Mexican-produced antidote is held exclusively in Florida.