Well check up on its successes and failures
http://www.alternet.org/story/144101/feeling_nervous_3,000_behavior_detection_officers_will_be_watching_you_at_the_airport_this_thanksgiving
98,805 stops 813 arrests so that's a success rate of under 1%
I might wonder if that's much better than chance
Of course that's probably not the sort of answer that will land you the job!
An intelligent answer might suggest that with figures like that Behavioral Detection is best used in conjunction with other intelligence.
In all areas of work people like to pick up the concept of 'continuous improvement' so you can drop that in and talk about the importance of metrics in measuring the effectiveness of BD so that improvements can be measured and the value of the process demonstrated