deejaye
No dinner is complete without a little dog hair...
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http://www.npr.org/templates/story/story.php?storyId=15041323
Here is a link to Dr. Bass discussing the sniffer. A body gives off over 400 gases, they have picked 20. The only reference here is its use for identifying human decomposition, nothing about determining time.
Thanks for finding that one...this one talks more about its use in "time"
http://www.popsci.com/scitech/article/2003-01/new-science-murder-victim-search