Police are using advanced DNA technology to find the killer of seven people murdered in Chicago in 1982 who unknowingly took Tylenol pills laced with a lethal dose of cyanide.
DNA evidence is being collected by several sources, including relatives of the victims and a family that survived the deadly attack that changed the way in which over-the-counter drugs are manufactured.
Specialized technology that extracts trace amounts of human DNA from items to analyze them, even if they’re old or degraded, is being used in the fresh probe.
