A Thermal camera that is properly rated for the task at hand, will find traces of termites where a standard inspection may miss them. For example, if a termite colony has taken up residence in a cavity wall of a house, there may be no signs of that infestation under the home or even in the roof void above that area, given that termite colonies produce quite a bit of heat, the colony will show up even if the walls are double brick.
Follow this link to see a photograph of a wall of a house where for successive years the pest controllers could not find where the termites were getting in. The termites in fact lived in the wall cavity on the second floor. http://www.pestec.com.au/technology
Thermal imaging is no "magic wand" but in many situations it is invaluable.
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