The 1,172-mile long Dakota Access Pipeline (DAPL) route submitted in its final permit applications starting in September 2014 would include a 72-mile portion through Morton County. The county became a focus of DAPL protests in April 2016. In August 2016 the Standing Rock Sioux Tribe (SRST) filed an injunction against United States Army Corps of Engineers (USACE) to attempt to halt construction. In his 58-page decision by United States District Judge James E. Boasberg shows that the tribe failed to participate in the process of the USACE and Energy Transfer Partners (ETP) to address the tribes complaints. Furthermore, the tribe did not cite a fear of water contamination in the injunction. The injunction request was denied and also failed on appeal. Amnesty International wrote a letter to Sheriff Kyle Kirchmeier on September 28, 2016, requesting that he investigate the use of force by private contractors, remove blockades and discontinue the use of riot gear by Morton County sheriff's deputies when policing protests in order to facilitate the right to peaceful protests in accordance with international law and standards. This letter was written in response to private security guards using guard dogs on advancing protesters on September 3, along with using pepper spray. On November 20, North Dakota police officers fired rubber bullets, tear gas, CS canisters and water from fire hoses at rioting protesters in subfreezing temperatures.