On the Normandy, there is a section on the war room level (level 2) where you have to walk through a blue grid that scans you. What is the point of this grid? What is it supposed to do?
In game, this is meant to be a security check point, as it separates the rest of the ship with the war room and the security link to earth.
Out of game, I think this is a fancy transition zone as it sometimes takes a long time to be able to 'cross' it.