Sheila and Katherine Lyon vanished exactly 42 years ago on March 25, 1975. Their abduction shocked the Washington, D.C. area. In this podcast extra, we look at some of the challenges that existed in searching for missing children in the 1970s, as well as some of the improvements and tools available today.

Episode 2: The Sketches

The 1975 disappearance of two young sisters from a suburban Maryland shopping mall traumatized the nation's capital, upending a family and the community's sense of security. More than 40 years later, the Lyon sisters bodies have never been found, but a man is set to stand trial for their murders.