We propose a revolutionary concept for detecting suspects engaged in illegal and potentially harmful activities in or around critical military or civilian installations. We investigate the use of thermal image analysis to detect at distance facial patterns of anxiety, alertness, and/or fearfulness. This is a totally novel approach to the problem of biometric identification. Instead of focusing on the question “who are you”, we focus instead on the question “what are you about to do”. Documented preliminary results clearly indicate the feasibility of the idea.