Immunity is argued by counsel.
The record is built first.

Qualified immunity is a judge-made doctrine that shields officers from personal damages liability in federal civil rights litigation unless the conduct violated clearly established law: law clear enough that a reasonable officer in the same position would have understood the conduct was unlawful. Courts decide it, often at summary judgment, and the argument runs on precedent, framing and timing.

All of that is legal architecture, and it belongs to retaining counsel. Which precedents count as clearly established, at what level of generality the right is defined, how the circuit treats the question, whether immunity is raised on the pleadings or at summary judgment: those are counsel’s calls and counsel’s briefs. A police practices expert has no opinion on any of them. The expert never opines that immunity does or does not apply, any more than the expert would answer the broader question of whether an expert can give legal conclusions; the answer is no, and the report observes that boundary on the record.

Counsel does not need an expert to explain the doctrine. Counsel needs the record that survives it: facts fixed to timestamps, training reduced to documents, standards stated at the level of practice rather than argument. That is the division of labor this page describes, and it is the reason a practices expert belongs in an immunity fight without ever touching the legal question.

A precise practices record serves plaintiff and defense counsel alike, which is why the practice is retained by both sides. The same national standards, the same complete record and the same method apply regardless of who signs the retention.

For plaintiff’s counsel opposing immunity, precision means specificity: exactly what training prescribed, exactly what the officer knew, exactly when. For counsel defending an officer, the same file matters in reverse: where the record shows conduct tracking training and generally accepted practice, the report says so plainly, and that documentation does its work in briefing. Neither use changes the opinion; the opinion is about practices, and it is the same either way.

The force analysis behind most immunity fights is use-of-force casework: the Graham factors, threat assessment, proportionality, and the totality of the facts and circumstances, measured on the complete record. That work is described in the excessive force expert witness practice. What the expert adds to an immunity fight is not an answer to the legal question; it is a record precise enough that the legal question can be argued on facts rather than characterizations. Legal conclusions remain counsel’s throughout.