A low temperature range infrared camera is a very useful tool in detecting the presence of water or moisture that ultimately leads to mold growth. Infrared or thermal inspection does not directly identify the presence of mold, but it may be used to find moisture where mold may cultivate, especially behind wall board.
But Beware! I have seen many cases where the infrared camera results have been misinterpreted. That is, the lower temperature readings than the surrounding area were not the result of water intrusion.