Well I only know a little C++ and barely any Java, but my idea is this: Instead of trying to discover the lazer shield values in the packets or whatever, what if you write some code that finds out that they don't have the fire shield, water shield, etc, or no shield on? Then, when it finds that none of those values are met, the lazer shield would be the only option left and it can safely ban the player. I imagine you've thought of that already and there's some reason it won't work...