"Bodies We've Buried" by Jarret Hallcox and Amy Welch. Page 101 of the January 2006 edition.
"Recently Dr. [Arpad] Vass, the same Dr. Vass responsible for developing some of the most extraordinary capabilities used to discover human remains, has fallen in love with the prospect of "divining for bodies."
In order to do this, he takes a metal coat hanger like you would get from the dry cleaner, the kind with the cardboard tube, and cuts it in half, discarding the hook portion. Using the cardboard pieces as handles, he ends up with two L-shaped diving instruments that can move independently of the cardboard. He then holds his hands at his waist; with the metal portion of the hangers pointing straight out, he walks toward where he thinks a body might be decomposing. As he gets close, the metal pieces will point inward. It is unbelievable, to say the least, but we have both done this and it feels as if a force is acting pon the metal. Dr. Vass in convinced that the gasses that are released from the body create a magnetic charge that is opposite of the earth's magnetic field, which interacts with the divining hangers. Can you say new research? This is something the class will try on the following day during their burial recovery exercise."