The rules seem to be arbitrarily enforced. When we went through security in MBJ last October, we had 2 lighters in our carry-on (I forgot that our driver had given us an old lighter with a bottle opener on the end to open our Red Stripes). The security personnel found both of the lighters in our bag and told us that we can only keep one of them. They asked us which one we wanted and threw away the other.