There are several liquid explosives that looks like water, not to mention acids, and other rather deadly chemicals.
What i dont get is all those things you can bring, like deoderant, shampoo, nail polisher.
Heck i bet you could baord with a bomb in parts.
Take the C4, and remove the detonator.
Place the varius parts in other electronic devices. When onboard assemble the thing, and boom.

Meh, i would rather say that tree is uncut money.

I'm confused.

Are these things not allowed inside, or are you not allowed inside when not wearing these things, includng service. You need to wear service.