My understanding of it is that it uses near-infrared LEDs (slightly longer wavelength than visible light) to illuminate your hands, and that's why certain types

My understanding of it is that it uses near-infrared LEDs (slightly longer wavelength than visible light) to illuminate your hands, and that's why certain types of light sources that emit a lot of light at these wavelengths are alleged to cause trouble. It makes sense that a laser pointer wouldn't cause any interference because laser light is not in the passband that the cameras can see.