and particularly with reference to fig1 the detection device of the present invention may include a source of noncoherent light 10 lasers provide coherent light for illuminating the evidence a a first filter 15 for filtering light from the light source 10 a light intensifier 20 for receiving and intensifying light reflected from the evidence a and a second filter 25 for filtering the reflected light before it is intensified in operation the method and device of the present invention exploits the wavelength shift of light reflected from a fluorescent substance as is well known the wavelength of light is increased by about 10 upon reflection from a fluorescent substance the light undergoes a stokes shift thus if a fluorescent substance is illuminated with light of a particular wavelength the reflection may be detected at a longer wavelength in the present invention light from light source 10 is filtered by filter 15 to illuminate a fluorescent substance with light having a predetermined band of wavelengths for example 555 to 565 nanometers when a fluorescent substance is so illuminated the reflections from the substance may be detected in a band of wavelengths about 10 longer 610 to 622 nanometers in this example by providing a second filter 25 that filters out light outside the wavelength band of the reflected light only the desired reflections are detected the filters 15 and 25 thereby cooperate to first illuminate and then enable detection of fluorescent substances to enhance detection of the reflections a light intensifier 20 may be.