Read more about the ban at Reuters.
Before approving the measure, California Fish and Game President Michael Sutton said awarding prizes for killing the largest number of coyotes and other creatures was unethical and that such contests “are an anachronism and have no place in modern wildlife management.”
Note from Eric - The quote from Sutton above brings out an interesting nuance - it seems like he is saying that the attitude or mind set of the hunter is important as it relates to ethics. If you are doing it for fame or money primarily it is unethical. If you do it for challenge and utilization of the animal (honoring the animal) it is ethical.
In a recent discussion on the controversial Idaho derby one of the Orion board members said this