The most important administrative measures employed to prevent fire are those that aim to reduce the amount of inflammable material in the National Forests. This is done in many different ways. The free use timber policy enables Rangers to give away much dead timber, both standing and down. Timber operators cutting on the National Forests are required by the Forest Service contract to remove dead snags, which are a fire menace, from the timber sale area. Where there is fire danger, all slashing resulting from such sales must be burned or otherwise disposed of. While grazing is usually not considered a measure to prevent fires, still grass lands that have not been grazed over become very dry in the fall and are a dangerous fire menace. Wherever it is feasible, old slash left by lumbermen on private lands adjacent or near to the National Forests are burned, when the fire can be confined to a small area. Another administrative measure is the reduction of the causes of fires by a patrol force. Forest Guards travel along the highways where there is most traffic and most danger. Their presence often is enough to remind campers, hunters and fishermen to put their camp fires out before leaving them. These patrolmen mix with the people and, if necessary, remind them in a courteous way to be careful to extinguish their camp fires before breaking camp. Most of the necessary legislative measures for preventing forest fires already exist. The National Forest force is seeking merely to obtain a strict enforcement of existing laws. Railroads are required to use spark-arresters on their locomotives and to provide for keeping their rights-of-way free from inflammable material. Logging camps must also prevent the destruction of National Forest timber by fire by using spark-arresters on all logging engines. The Forest officers are ever on the alert for the detection and apprehension of campers for leaving fires unextinguished and incendiaries for starting fires willfully. These careless individuals are arrested by them without warrant, either under the Federal laws, if the fire occurred on National Forest lands, or under the State law, if it occurred outside of government lands.