If you got bit by a rattlesnake why not suck the venom out and spit it out?

The Cutter Snake Bite Kit was invented many decades ago for this very purpose, as it was then thought to be an effective method of preventing venomous snakebite consequences. As it was made to be used in place of sucking venom out of the snakebite location by mouth, the thinking then was that its use would prevent any poison consequences to a person sucking out venom if he had any open sores in his mouth that the venom could enter and cause damage.

Later, more thorough and scientific testing showed that only immediate venom removal was partially effective, but that it was still no absolute solution as much of the venom injected could not be removed by suction and the victim still suffered consequences nearly as great as if nothing was done.

The invention of anti-venom serum by injection has eliminated all other attempted methods of snakebite treatment and today is the primary method of amelioration. The faster a victim is treated with serum, the fewer consequences will be experienced but it still does not make a venomous snakebite anything less than a victim's nightmare. The best advice is to be aware, alert and use good common sense in snake country to avoid any interaction.