An immigration officer charged in Minnesota with shooting and wounding a Venezuelan man walked out of a Texas jail on Thursday, after a judge there blocked Minnesota’s attempt to bring him back to face the charge.

Christian Castro, an Immigration and Customs Enforcement agent, is accused of firing his weapon into a house and wounding Julio Cesar Sosa-Celis in the leg. Hennepin County Attorney Mary Moriarty is demanding that he be taken into custody and returned. He has not been convicted of anything, and the charge remains an allegation.

How extradition between states normally works

This is the part that makes the case unusual, and it needs a little constitutional background.

The United States Constitution contains an extradition clause requiring that a person charged with a crime who flees to another state be delivered up on demand of the state where the charge was brought. Every state has enacted a version of a uniform statute implementing it.

The key feature of that process is that it is administrative rather than adjudicative. The receiving state does not weigh the evidence, assess whether the charge is sound, or decide whether the prosecution is wise. The questions available are narrow: is the paperwork in order, is this the person named, is he actually charged, was he in the demanding state at the time. The Supreme Court has held that a governor’s duty here is essentially ministerial.

Which is why a judge blocking an extradition request attracts attention. It is not that it cannot happen — technical defects in the demand can defeat it — but the grounds are meant to be procedural, not a judgement about the merits of the underlying case.

The federal officer question

There is a second layer here that will matter more than the extradition fight in the long run.

When a federal officer is charged under state law for something done in the course of federal duties, two doctrines come into play. The officer can seek to move the case from state court to federal court. And he can raise what is known as a supremacy clause defence: broadly, that a federal officer doing what federal law authorises, and acting reasonably, cannot be punished by a state for it.

That defence is not automatic and it is not unlimited — it turns on whether the officer’s conduct was necessary and proper to his federal function, and whether his belief that force was needed was reasonable. But it means the substantive question is likely to end up in federal court regardless of what any state judge decides about paperwork.

The two arguments

Minnesota’s position, put by the county attorney, is that a shooting into a house is an ordinary criminal matter that a state is entitled to prosecute, that the extradition process is not supposed to be a venue for reconsidering the charge, and that treating it as one means a federal badge functions as immunity from state law.

The counter-position, made in similar cases by federal law-enforcement associations, is that officers operating in hostile jurisdictions face the prospect of politically motivated local prosecutions, that split-second decisions are being second-guessed by prosecutors with an interest in the outcome, and that federal courts exist precisely to handle that conflict.

Both positions describe a real risk. The structural problem is that the country has no settled mechanism for the case where a state believes a federal officer committed a crime and the federal government disagrees.

What happens next

Minnesota can renew its demand, cure any defect the Texas court identified, or seek relief in federal court. Whether the Justice Department takes a position, and which one, will tell you more about the direction of this than any of the statements issued this week.

Related: the second deportation flight to Haiti in a week.

Sources

Statements from the Hennepin County Attorney’s Office; Cameron County Sheriff’s Office records; Democracy Now!; US Constitution Article IV; Uniform Criminal Extradition Act; federal case law on supremacy clause defences.