Thats not what I said, I said there are already techniques to interview people to find certain things out such as extremists etc., but we lack the will to ie train people to use them. I mean border guards do get training on how to read people, and what questions to ask , I'm sure that training could be refined and used in immigration.
Why do I have such faith, well I know it works because reading people has saved the lives of a few military people when working a vehicle check point, looking for IED's and or terrorist...and well i'm far from being an expert i'm sure someone that had more than 5 mins training like we did , could be a lot more effective...
Interviewing someone for a job is way different than allowing them into the country. most of the companies I had interviews with were some guy off the floor placed in the HR position with no formal training...And I did not say interviews are the end all be all, one has to take that info and follow it up, such as phoning references, doing back ground / criminal checks etc etc...
Not investing into it will also not solve anything, so I guess we are stuck in some endless cycle right.....all solutions require a few things one is will to find a solution, carry it out and to fund it...thats not being naïve thats just how things are.