I an quite sure that every morning when they put their materials on , they made a check and ajust sensibility
So you can go in the same channel on 2 diferents days wearing the same thing and day 1 it's OK day 2 you have to be search
Last time I go through security in CDG I have forgot my bluetooth hearing in my pocket and the system have not detectet... but I have to remove my shoes !!!!!!!
wonderful world ....