There is one snakebite kit that does work. But the device generates way more suction than a person’s mouth can.
My brother hunts in upstate NY and often hikes areas in the off season to see if he wants to hunt there later on. This was a few years back but NYS kept telling him there weren't any rattlers in the state. He came up over a ridge and looked down to see hundreds (he stopped counting at 100) of rattlers sunning themselves on a large ledge. He took pictures. NY still tells him “there aren't that many”.