Scorpions live pretty much everywhere. They like tight places to sleep in so you will find them climbing into shoes, gloves, folded towels, and other obscure locations to rest for the day. They live in walls because the walls of a home provide water and food.
Simply put, scorpions eat other bugs.
Scorpions are native to Mesa and Phoenix.
Scorpions can enter a home from any gap that is 1/8th inch or larger. They enter through j-rails and doors. They enter through windows. Home seals and weep-hole screens can reduce this, but your best defense is a good exterior barrier from a monthly pest control application.
Scorpions make good lizard food. There are many predators to scorpions, birds, cats, mice, rats, even humans in certain locations eat scorpions. So lizards eat scorpions, spiders eat scorpions, scorpions eat scorpions and people eat scorpions.
Certain pest control methods and specific pesticides have been proven effective in residual control of scorpions. Bulwark has based is scorpion control service off of University finds. But don't just take Bulwark's word for it, see their customer comments to the East Valley Tribune.