We have the same issues going through heliport security when flying out to the rigs. We can't bring lighters or pocket knives onto the choppers, even in our bags, but once we get to the rig, the rig supplies us with matches and "alternative cutting devices". We also have to have security questions on file, in case someone makes it out to the rig without an ID, but we can't get on the bird without two ID checks and a urine screen. And THAT is at Marsec level one, the lowest level. Common sense has no bearing on the rules!