Captain EFIS. Screening of airport staff before and after theirshift, while sound in theory is entirely impractical. Staff move around the airport constantly, often handling flights in many different locations on just one shift, GA domestic, freight, Intl and aften twice in a shift. There are two many people and two many entrance points, not to mention all the vehicles, catering trucks, tankers, sevicing equipment that comes from various parts of the airport and off airport. You would have to have literally hundreds of screening points.
In anycase, once you have been there for a while and know the system, it doesnt matter what procedures they put in place, you can allways get around it.