Scorpion venom is used to capture prey, usually insects and spiders, and to defend themselves. The venom of a scorpion affects the victim's nervous system. Only about 20 types of scorpions have venom that is dangerous to humans, and only one type of scorpion venom is fatal to humans. And, yes, that one type is here in Arizona! It is very rare to die from a scorpion sting, though. Because we know that the one potentially fatal scorpion exists in our desert, there is plenty of antivenin readily available in the area.