well, many hikers carry 9 volt batteries in case of snake bites; the translators for Wycliffe actually sell stun guns for their missionaries out in the field for extremely venomous snakes, in Mexico sometimes they use car or motorcycle batteries.
the "medical" "scientific" studies on this has not given good results because they use mice as "testers" in a funky lab setting and have never tested it on humans. and it is a known fact that animals and humans have different reactions to things, despite what the "scientifics" claim. However, those humans who have used electricity swear by it. for bee stings too.
personally i know for a fact it works on the huge red harvester ant of the sonoran desert (they are about 5 times BIGGER than the red ant. i was amazed. took 19 minutes.