How do we know for a fact that the 9/11 confession was genuine and NOT a forgery?

The definition of a forgery is when a copyrighted thing is used without permission. This has to do with art works, legal papers and intellectual property. The leader of the movement that caused so many innocent deaths all over the world was proven but it took much time to find him.Innocent until proven guilty is the law in America. Many other countries in the world say you are guilty first before investigation. this is just one reason America is good.Also we have great leaders.Our democratic system weeds out the wrong ones.Vote.