A Federal Appeals Court has decided in favor of the Standing Rock Sioux’s request to strike down federal permits for the Dakota Access Pipeline. Nearly three years after crude oil started to flow, a federal judge has ordered the U.S. Army Corps of Engineers to conduct a full environmental review. The judge found that found that the Army Corps of Engineers failed to conform to National Environmental Policy Act (NEPA) regulations when allowing construction of the Dakota Access Pipeline to pass under Lake Oahe in North Dakota. The two sides submitted their legal arguments on Thursday on why the pipeline should (or should not) be shut down until a good Environmental Impact Statement has been prepared. That could take a year or more. Shutting down the project is the normal response to a violation of NEPA.