Very few people ever get bitten and even fewer die. They are night hunters and it is best to be very careful at dusk when they are starting to come out and difficult to see.
A lot more people dying from Lyme disease than rattlesnake bites in the USA. It is the scorpions that I would want to exercise care around as people in moving into the desert areas are in these critters home territory. Scorpions though can be spotted with a UV flashlight and you can buy ones for less than $10 on Amazon.
Snake bite kits are a waste of money but I do own a couple of the UV flashlights and use them when in the desert (which includes the cities and places like Phoenix).
If you have pets don't let them out unsupervised and don't allow them to run around off lead.
