Question about Cadaver Dogs?

They are detecting the scent of human decomp, not necessarily a piece of dead human. If someone died but did not decompose in a location, they will be unable to detect that, but they will be able to detect traces of decomposition if, say, a body was moved after a few months of decomposing in a location. That doesn't necessarily help a detective or archeologist when they dig and find nothing there (dogs' noses are more sensitive than any scientific equipment we've been able to create so there is no was to verify the dog was right without finding something substantial).

Some dogs are even able to detect such small amounts that a 600-year-old bone 6 feet under will be alerted - http://www.news.com.au/national/this-dog-has-a-nos...

both they pick up the sent of the dead and will lead you to it if the body has been moved via human of animal the dog will let you know and take you to it if it cant it is trained to tell you the direction the sent leads and try and follow.

what a strange question, why would you want your dog to trace a decomposed body