Whenever possible patrol officers should inform the owner or occupant of private lands that they propose to avail themselves of their power of access to those lands. If a direct challenge is made of an officer's authorities to carry out duties by a rancher farmer or plant operator, etc., the matter should be immediately brought to the attention of the office supervisor. In most cases consent will be given in advance for extended periods; if not and after all methods of persuasion have failed including eff orts by persuasion have failed, including efforts by personal interview and the placing of the landholder on notice of the law by registered mail, officers may gain access to areas within the twenty-five mile area by the most expeditions means, if absolutely necessary. This is an extreme measure and is to be resorted to only on the direction of a supervisory officer after careful consideration. The fences and gates should be repaired immediately and precautions taken to avoid damage to the property.