THE GENEVA CONVENTION & ENEMY NON-COMBATANTS

Poltifact notes that Article III (AKA Section III. Treatment of persons in the power of a Party to the conflict) of all FOUR Geneva Conventions DOES apply to terrorists:

Article 75. FUNDAMENTAL GUARANTEES.

1. In so far as they are affected by a situation referred to in Article 1 of this Protocol, persons who are in the power of a Party to the conflict and who do not benefit from more favourable treatment under the Conventions or under this Protocol shall be treated humanely in all circumstances and shall enjoy, as a minimum, the protection provided by this Article without any adverse distinction based upon race, colour, sex, language, religion or belief, political or other opinion, national or social origin, wealth, birth or other status, or on any other similar criteria. Each Party shall respect the person, honour, convictions and religious practices of all such persons.

2. The following acts are and shall remain prohibited at any time and in any
place whatsoever, whether committed by civilian or by military agents:

(a) Violence to the life, health, or physical or mental well-being of persons, in particular:
(i) Murder;
(ii) Torture of all kinds, whether physical or mental;
(iii) Corporal punishment; and
(iv) [Mutilation];
(b) Outrages upon personal dignity, in particular humiliating and degrading treatment, enforced prostitution and any form of indecent assault;
(c) The taking of hostages;
(d) Collective punishments; and
(e) Threats to commit any of the foregoing acts.