Historical studies by Zimmerman and others suggested that energy healers produce measurable electromagnetic fields from their hands when healing. However, external environmental fields may have influenced these measurements. We repeated the measurements at the Scripps Research Institute, UCSD, using a highly sensitive superconducting quantum interference detector in an electromagnetically shielded room, so that outside influences would not affect readings. The electromagnetic fields from the hands and hearts of three Reiki Masters were measured when they were: (1) not practicing Reiki, (2) sending Reiki to a distant person, and (3) sending Reiki to someone in the room. Similar measurements were made on four Reiki-naïve volunteers before and after they received a Reiki attunement. Unlike the previous studies, data analysis from all subjects showed no change in the field produced by their hands or hearts when they practiced Reiki. These results do not support the hypothesis that Reiki increases the electromagnetic field produced by the hands and hearts of Reiki practitioners when healing. The article abstract can be found here.