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The thermal imaging system used by the government in Kyllo (in 1991) was a breadbox sized camera with an analog video output that had to be hooked up to a power supply, video monitor, and VCR. It cost about $100K.

Today's version has better resolution and dynamic range and fits in a small dongle that attaches to a smartphone. It costs less than a couple hundred bucks and you can get it delivered overnight from Web vendors.