capture the target individual, load them up on whatever sedating drug is available, train their subconscious to react to certain elements of reality that happen day-to-day. coinciding with virtual out-of-the-realm-of-possibility or leading them to believe in a certain basic psychological war-fare principal in such a case, would lead to the individual giving up any information during the capturing process, and also give better means to understand the individual in order to practice reactions over and over again in a virtual training session.
the training could/can get quite advanced, such as counting a certain number of seconds before reacting, but the reactions are limited to simple knee-jerk reactions such as (but not limited to) blinking or looking in a certain direction.
this method does not require much money, or resources, just time.
the same method could be applied to training oneself, how this is accomplished i do not know, but i want to hear suggestions.