customs don't care.. because customs looks at goods and
conveyances 
but the Immigration authorities.. should look out...
when i was doing research, and being totally incensed by the total
lack of action, it was a kinder, gentler time before airliners
smashed into skyscrapers.. so no one cared...
you get the bleeding hearts out there screaming blue murder about
authorities taking biometrics like fingerprinting.. they probably
didn't lose a loved one to such actions...
worse still, more research showed that terrorism is mostly if not
all, STATE SPONSORED
the money that supported the people who smashed the planes into the
skyscrapers lived on Saudi money, most of them were Saudis...