If the victim is covered by concrete or other sealing material, the dogs cannot sniff through this material. But the pressure of the material and the rate of decomposition causes the body to express decomposition gases that will escape from around the sides of the material where the material and dirt contact each other. EVEN IF THE BODY HAS SINCE BEEN REMOVED and the area recovered, the soiled ground will continue to give off the scent for many years.

 

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