Mormons and polygamy

I am told that the law(s) against polygamy are not particularly enforced in Mormon dominated Utah.[1] But I am also told that Mormon's no longer believe in polygamy. Something does not seem to add up here.

  1. Ms. Emily Yee. "So judges interpret the law... but don't have to live by it?" TownHall.com 2005-11-03. http://www.townhall.com/blogs/c-log/EmilyYee/story/2005/11/03/174091.html