When those entrusted with the power of the state are themselves called to account, the machinery of justice turns inward — slowly, but with consequence. An Immigration and Customs Enforcement officer surrendered to federal authorities Thursday, facing charges not for the shooting at the center of the inquiry, but for allegedly lying about it. The case, unfolding within the fraught terrain of federal law enforcement accountability, raises a question older than any single incident: not merely what happened, but whether the truth of it was told.