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Thermal imaging allows people, good or bad to see in complete darkness.
Both intensified cameras and IR illumination require some lighting in order to be effective. By contrast, thermal cameras detect the smallest changes in temperature between objects and turn them into a video image.
This is scary stuff, but did you know you can block this so you are invisible to the cameras? This works extremely well with the FLIR cameras everyone seems to have these days.
This method of blocking IR will hide your warm equipment and possessions too.