Yes you can lock it. If they see something in x-ray it will go direct to 'naughty room'.
They rarely open a bag even if they suspect contraband.
Ray McDonald / Snoozeman
My Personal Cruise Blog: My Cruise Blog
Future Cruises: Carnival Triumph-Caribbean-7/28/2014, Carnival Legend-South Pacific-8/30/2014, MSC Preziosa-Mediterranean-10/25/2014, MSC Fantasia-Mediterranean-11/2/2014, Navigator of the Seas-12/14/2013, Norwegian Jewel-1/3/2015, Emerald Princess-1/11/2015, Carnival Freedom-2/2/2015, Carnival Freedom-2/15/2015.