Caupon: In my experience the fact that some science is difficult to understand provides an opportunity for young earth creationists (for example) to offer flawed, incorrect or oversimplified explanations of the science to fit their viewpoint. Creationist often point out the flaws in the dating methods as if to say science ignores these issues, when this is not the case.
A video that gives an understanding of K-Ar dating: https://www.youtube.com/watch?v=NMZ5kJEviD0