In the fire service here in Pa we use Thermal imaging cameras during our initial searches. Once a body cools it is(the camera) virtually useless. Most Coast Guard helos have a similar camera called a Flir (pronounced fleer) camera. It is another tool to help in ititial searches. Both cameras show hot objects in their environments However quite expensive. Our original camera was about 15000 dollars. They since have come down in price a bit. We can't over state how important these tools are to us in the fire service. My prayers to the family of the lost person.
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