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Multiple interrogator techniques
From Citizendium, the Citizens' Compendium
Multiple interrogator techniques are ways of applying other interrogation methods, using more than one interrogator in the questioning system. Use of an essentially passive translator is not a multiple interrogation technique, and, indeed, doctrine requires that the prisoner be told to look at the interrogator, not the translator, if translation is required.
Multiple interrogation techniques can involve more than interrogators in the same room, or can use teams of interrogators operating in shifts. The latter has to be used with caution and in compliance with guidelines on extended interrogation techniques, since changing investigators and giving them rest could allow the session to go beyond desired and humane length. Classic "sweating" police interrogation, with multiple, often shouting, questioners, using bright lights in the prisoner's eyes is usually considered coercive and may go into torture; courts have thrown out civilian convictions based on improper use of team interrogation.
If the plan for the interrogation is based on a method such as Prove Your Identity, it is not unreasonable to have one interrogator asking question while the other verifies statements.