Rumple: What do you mean "through security"? It has been stated, at some airports, that crews can take crew bags/flight bags through crew security on duty. No liquids. (why not if they are tested by the pilot? If it's OK for baby's milk to be drunk as a test, why not crew drinks? Has BALPA been consulted on any of this?) However, if passing through pax security, even if on duty at that airport, they are subject to the same rules as pax.