Zapping using one wrist makes it easy for a person to not get the electrical current into the main arteries. Use the ankle-to-ankle method. The biggest error with the Beck protocol is not zapping long enough or hard enough or placing the electrodes correctly. A little common sense says that using the same wrist could easily leave room for error with having the electricity jumping across the capillaries from one electrode to the other. The ankle-to-ankle method will treat a lot more blood. It is not that difficult to set up either. After you work up to lengthy zapping times. It would be best to zap ankle-to-ankle overnight. A good 8 hours of zapping (after you work up to it) will really cleanse the blood of all viruses & parasites. If you are going to use the Beck protocol don't use the same wrist method.