I tend to agree on the merits of food scraps in the river but the key is its still against policy and that is clear every time you launch.Nels is a good old timer, have done a few trips with him on the southwestern rivers. Bummer he got fined for collecting firewood. As AMV48 stated, I too, have done Science trips and have created "drift wood rafts" tied to shore to study the effects the "shade" plays on the fish and the aquatic/terrestrial invertebrates. Refuse is questionable. You may think plastic, DO's and what not, but it can be food scraps. The issue is there is a different train of thought between the commercial guides, privates and the scientists. The river has been depleted from many nutrients that the fish need, so there is nothing wrong with throwing food into the rio as long as it doesn't float. (or at least thats what many food based scientists think). Bleach and soap goes in the river.