MAINOUR, crim. law. The thing stolen found in the hands of the thief who has stolen it; hence when a man is found with property which he has stolen, he is said to be taken with the mainour, that is, it is found in his hands.
     2. Formerly there was a distinction made between a larceny, when the thing stolen was found in the hands of the criminal, and when the proof depended upon other circumstances not quite so irrefragable; the former properly was termed pris ove maynovere, or ove mainer, or mainour, as it is generally written. Barr. on the Stat. 315, 316, note:

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As a result of search operations on November 19, one of the active members of this grouping Placido Hernandez Lopez, 32, was arrested with the mainour.
As, for instance, where the appellant is an infant, or a woman, or above sixty years of age, or where the appellee is taken with the mainour, or has broken prison.
In all likelihood, a comparison is made here with a thief taken with the mainour, that is, with the stolen goods on his person.