(AP) — A former Kansas City, Kan., police detective has filed an appeal after losing a lawsuit claiming he was punished for refusing to conceal a motorist’s beating by federal agents.

Attorneys for Max Seifert filed a notice of appeal Friday seeking to reverse the summary judgment granted two days earlier to the Unified Government of Wyandotte County, the sheriff and an undersheriff. Seifert wants the opportunity to present his claims to a jury.

Seifert alleged in his lawsuit he was retaliated against after investigating Drug Enforcement Administration agents involved in a 2003 road-rage incident that left a man with permanent brain damage.

His attorneys said in a statement Friday that Seifert’s testimony was crucial in that case in proving the agents had “mistreated and beaten a helpless citizen.”