Glossary · Doctrine
T.J. Hooper
The 1932 Second Circuit case (60 F.2d 737) in which Judge Learned Hand held that an entire industry's customary practice can itself be unreasonably negligent if better, available safety measures are ignored.
Also known as: The T.J. Hooper, T.J. Hooper case, TJ Hooper, 60 F.2d 737
What it is
The T.J. Hooper, 60 F.2d 737 (2d Cir. 1932), is a landmark American negligence opinion authored by Judge Learned Hand of the Second Circuit Court of Appeals. The case involved a tugboat company that lost barges of coal in a storm; the tugs had not carried radio receivers that would have warned of the weather. The receivers were available and inexpensive, but most of the tugboat industry did not yet carry them.
What the court held
Hand rejected the defense argument that following industry custom satisfied the duty of reasonable care. In one of the most-quoted passages in American tort law, he wrote: "A whole calling may have unduly lagged in the adoption of new and available devices. It never may set its own tests, however persuasive be its usages. Courts must in the end say what is required." The ruling established that industry custom is evidence of reasonable care, but not a complete defense.
Why it matters in malpractice
T.J. Hooper is foundational authority for the proposition that the medical profession's customary practice cannot itself define the standard of care if better, available diagnostic or therapeutic technology has been ignored. As medical AI, advanced imaging, genomic testing, and decision-support tools become widely available, plaintiffs increasingly invoke Hooper to argue that customary practice has lagged behind reasonable prudence.
Practical implication
The doctrine cuts both ways. Plaintiff counsel uses it to attack a "we always do it this way" defense; defense counsel uses it to argue that custom does at least raise a strong inference of reasonableness. The MedMalPredict platform is named for the case because the same principle applies to malpractice analytics: lagging informal practice is not a defense when superior tools exist.
See Also
- Standard of Care — The level of skill, diligence, and judgment a reasonably competent practitioner in the same specialty would exercise under similar circumstances, used as the benchmark for proving negligence in a malpractice case.
- Industry Custom — The prevailing practice of a profession or industry, used as evidence of (but not conclusive proof of) the standard of care under the doctrine of T.J. Hooper.
- Hooper Engine — MedMalPredict's proprietary AI prediction system, trained on more than 220,000 historical medical malpractice cases, that produces jurisdiction-aware predictions for payment probability, payout range, and outcome severity.
- Breach of Duty — The element of a negligence claim that requires the plaintiff to prove the defendant's conduct fell below the applicable standard of care.