I respectfully disagree. Any investigator "worth his salt" should be able to conduct a better interview, even if he had to use questions similar to the ones on the Civil Service test, then just answering, Agree, Strongly Agree, etc, on a written test. That's what detectives / investigators do, they interview people and get to know whether they're lying, telling the truth, being sincere, etc. Almost anyone can sit in a room with no one watching them and answer questions on a piece of paper and be able to "beat the system" as others on here have said. Sure, they could do the same with a background investigator but at least the investigator has a better chance than a piece of paper. Just my opinion after taking two Civil Service tests, being an investigator, and listening to what many others have said in this thread. I hope those that deserve to be hired, are.