Kautilya's Arthashastra 4.8.14

4.8.14

mandāparādhaṃ bālaṃ vṛddhaṃ vyādhitaṃ mattam unmattaṃ kṣutpipāsādhvaklāntam atyāśitam āmakāśitaṃ durbalaṃ vā na karma kārayet //

Ignoramuses, youngsters, the aged, the afflicted, persons under intoxication, lunatics, persons suffering from hunger, thirst, or fatigue from journey, persons who have just taken more than enough of meal, persons who have confessed of their own accord (átmakásitam), and persons who are very weak,--none of these shall be subjected to torture.