Joined: Mar. 2005
Re "then do you suport my statement? "
I don't think I did. You asked if a law could be proven. It can be tested against observation; if it's wrong enough observations ought to spot someplace where the "law" doesn't hold. For example, Newton's law of gravity is shown incorrect by the movements of planet Mercury (which moves fast enough for relativity to affect it's position to a measurable extent). If by "proof" one means "prove beyond reasonable doubt", then a scientific law might be said to be proven within the areas in which it's been tested. But that's not usually what's meant by "proof".