In a nut shell, you are not wanted in Utah if you are coming here to fish. Fly fishermen(women) were pointed out as the bad element. The representative (McIff) who sponsored the bill is quoted as saying the movie, "A River Runs Through It" has created the problem becasue it glamorized fly fishing and brought hords of them out into the rivers and streams causing a raft of problems. Here is a link to the fools editorial in the local paper.
http://www.sltrib.com/opinion/ci_14853985

And this nutcase was a judge of some sorts.