What's the difference, or are they the same thing. I have seen on You-Tube, kids laughing at a 100,000 volt sting on the arm from a hand held stungun. And I have seen on TV, rookie cops getting the probs from a taser shot at him and stick in his chest during a training seminar with a completely different reaction. So why such wildly different reactions? Is it an amperage difference between what police use and what civilians can buy??