Conclusions as to use cannot be drawn from abuse.
Definition of Ab Abusu Ad Usum Non Valet Consequentia
Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
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Ballentine's Law Dictionary -
Black's Law Dictionary: 2nd EditionA conclusion as to the use of a thing from its abuse is invalid. Broom, Max. 17.