In a September 30, 2026 order, the U.S. District Court for the District of Colorado found that several authorities cited in a self-represented servicemember's objections in a tax dispute with the Colorado Department of Revenue bore hallmarks of citations hallucinated by generative AI, including wrong courts and holdings described as the opposite of their outcome. The court struck the objections without leave to refile and ordered the filer to show cause why he should not be sanctioned.