If the person they are torturing is trained to resist torture (as presumably most agents are) then it will be very difficult to get useful and reliable information out of him or her. They will all talk yes, but the torturer will have to sort through the information to figure out what is real, most of which will be misinformation or half-truths.Which is why torturers will start by asking questions they know the answers to, and make it very clear that false answers will not stop the torture.
If you turture multiple people in a group and they have a common cover story that all of them know this becomes even more difficult for the torturer. That is what ended up happening with many of those we tortured in the early 2000s.
For example if you are trying to find out who the mole is and all the enemy have agreed to finger a certain person who is not truely the mole, more than likely that is the person the torture will reveal.
As alluded to by a poster above, traditional espionage and surviellance is generally a more reliable way to get information. Of course access to spells like charm person, zone of truth or detect thoughts could change this in the d&d world.
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