>> we were still thinking she was going to come back. even when i was printing the flyers, i remember still thinking she was going to come back from some camping trip that she was having so much fun she just didn't want to come home for. >> investigators were stunned to discover tiny metal fragments on stephanie's body, like the ones found in the arlene jensen case. >> the first natural thing you have come up in your brain is, oh, these two people are connected. >> at 100 times magnification the fragments looked identical. but were they? to find out, analysts turned to a process known as energy dispersive x-ray spectrometry. the samples were bombarded with electrons. this created x-ray frequencies which were then charted and compared. >> each element has a set of characteristic x-rays. iron is different from chromium and chromium is different from