The official text
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Code of Criminal Procedure, 1973
Section 266 Definitions
In this Chapter,—
(a) “detained” includes detained under any law providing for preventive detention;
(b) “prison” includes,—
(i) any place which has been declared by the State Government, by general or special order, to be a subsidiary jail;
(ii) any reformatory, Borstal institution or institution of a like nature.
Bharatiya Nagarik Suraksha Sanhita, 2023
Section 301 Definitions
In this Chapter,—
(a) “detained” includes detained under any law providing for preventive detention;
(b) “prison” includes,—
(i) any place which has been declared by the State Government, by general or special order, to be a subsidiary jail;
(ii) any reformatory, Borstal institution or other institution of a like nature.
The texts are India Code’s. The amendment markers and footnotes of the official print are left out, so the old section reads as it stood when it was repealed; State amendments are not shown. The PDFs linked below carry the full history.