Mounting it behind any tinted surface will degrade the laser pickup...but as mentioned...if you get hit with laser, you are likely done anyways. There is no detector on the market that can detect laser far enough ahead to give you more than a second...maybe 2 tops...so if you are hauling ass, you're cooked.
In regards to tinting affecting X, K, and Ka...it does not affect it at all. IRRIDIUM coated ones will, or any with a reflective surface, as they are typically a metallic film. That is why in a car, you don't want to mount it way up next to the roof, on the windshield...since most cars have a metallic film that shades the top 2-3 inches...
X, K, and Ka are not "light" like a laser...so it does not get affected by standard tinting...
Keep in mind that motorcycle windshields are MADE tinted...it is not added on afterwards like car tinting...so the 2 are not alike.