Hi,
Can you cite your sources on that?
Sure!
http://forums.equipped.org/ubbthreads.php?ubb=showflat&Number=288596#Post288596 
The point is, this is a regulation, not a law (or a right).
In practice, security staff retain a fair amount of discretion. If you give them a bunch of grief at the gate, you will not come out ahead. Ever.
It's wiser to stay well within the parameters of a regulation that is eminently more sensible than the one it replaced.