U.S. Supreme Court Good law

Kansas v. Crane

534 U.S. 407 (2002)

Commitment does not require total inability to control behavior — but it does require proof of serious difficulty controlling it.

Court
U.S. Supreme Court
Decided
January 22, 2002
Reach
Nationwide — the proof every civil-commitment case must meet
Verified
September 30, 2026
Read the opinion All cases

Good law. Still followed. Later cases may have narrowed it — see Scope. Binds every court in the country on the federal question it decides.

What happened

After Hendricks, Kansas sought to commit Michael Crane on diagnoses of exhibitionism and antisocial personality disorder. The Kansas Supreme Court read Hendricks to require a finding that he could not control his behavior at all.

What the court decided

The Court vacated that ruling. The Constitution does not require total or complete lack of control, but it does require proof of serious difficulty in controlling behavior — enough to distinguish a dangerous person with a mental abnormality from the typical repeat offender dealt with in an ordinary criminal case.

Why it matters to the Registry

This is the working standard in commitment trials today. Experts and juries argue over “serious difficulty,” not simply over whether the person is dangerous.

What it did not decide

The Court declined to give a precise, mathematical definition of the required lack of control, and did not decide whether emotional as opposed to volitional impairments alone can support commitment.

Legal Disclaimer

These are plain-language summaries of court decisions, written for general education. A ruling binds only the courts beneath the court that issued it, later decisions and new laws can change what it means, and how it applies to any one person depends on facts a summary cannot capture. Read the opinion itself, and talk to a lawyer licensed in your state before relying on any case. This page is not legal advice.