Police are using advanced DNA technology to find the killer of seven people murdered in 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.
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