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NeCede's

Maxim 1.5.50

Whosoever is skilled in his profession is to be believed.

Cuilibet in sua arte perito est credendum.

Source: Co. Litt. 125; Jackson Difficulty 1/5 — Foundational

Explanation

Expert testimony is given credit in matters within the expert's field — but the same expert has no special authority outside his area of competence.

Where this applies

  • An expert witness testifies about something outside their field of expertise.
  • A doctor's opinion is given on a legal question rather than a medical one.

Legal domains

commercialequity

Cite this maxim

NeCede Max. 1.5.50 — Whosoever is skilled in his profession is to be believed. — Co. Litt. 125; Jackson (Cuilibet in sua arte perito est credendum.)

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