A person may use temporary blinds and tree stands that are brought in and taken out daily on Service controlled lands. Hunters may use natural stands of vegetation that are present and left uncut at the hunting site. A person may not use blinds constructed of reed grass, Phragmites australis. A person may not use, construct, or cause to be constructed, permanent blinds, or tree stands on Service controlled lands except by a use permit from the Service, unless those structures were provided by the Service for the convenience and use by the public. Violation of any provision or restriction of the permit shall constitute a violation of this regulation.