1. A method for denying visual access from a target area, the method comprising: generating a structured light pattern with a laser pattern projector that projects light including a plurality of wavelengths; projecting the structured light pattern onto the target area; receiving light returning from the target area, the received light comprising reflected and retroreflected light; detecting a presence of a sensor in the target area; and analyzing the received light to characterize the sensor, wherein the sensor is characterized as a biological sensor, a visible light camera, or an infrared camera based on spectral ratios of the received light.