In this kind of protection work, as in the case of forest fires, it has been found that preventive measures are much more effective and much less costly than remedial measures. The regulations under which the Forests are administered give the Secretary of Agriculture power to institute preventive measures. To insure the sufficiency and purity of the water supply of a municipality or of an irrigation district, or to prevent floods and snowslides, the use of watersheds for grazing, timber, special uses, or settlement is especially restricted when such restriction is found to be necessary. On steep grass or timber-covered mountain slopes both grazing and timber sales are prohibited, if necessary.
_Public Health._ From the relation which the National Forests bear to the streams that issue from them, it will be seen that they may exert a great influence upon the health and general welfare of the communities in the valleys below. All persons either permanently or temporarily camped upon National Forest land are liable to trespass proceedings if unsanitary conditions result from their presence. All camp refuse must be disposed of either by burying or burning. This regulation applies to hunting and fishing parties, as well as to large logging camps, sawmills, and construction camps on National Forest lands. Thus the regulations strictly guard against the pollution of the water supply of the people who live in the large towns and cities, and also those who live on the Forests or near them. The watersheds tributary to many of the large western cities and towns are under special protection by the Forest Service. Under this sanitary regulation, it is possible to maintain such control of them as will greatly reduce the danger of typhoid and other enteric diseases.
_Violation of Game Laws._ Wild game, fish and birds add materially to the enjoyment of the National Forests by the public, and their protection and preservation is a duty of Forest officers. Although this duty rests primarily with the State the Forest Service assists, as far as practicable, in the protection of game on the National Forests from illegal practices. Forest Service officials are at the same time State Game Wardens. In the event of a violation of the state game laws, they either apprehend the offender or report the matter to the proper state official.