I asked a question about airline carry on allowance: Airplane carry-on allowance and plastic bags
A couple of answers implicate that security checkpoint has some sort of role in controlling baggage allowance, which is surprising to me as I thought it would be airline specific. My question is, how does the security checkpoint verify that brought carry-on luggage conforms with airline's carry-on luggage rules.
For simplicity, let's assume a scenario that I come to security checkpoint with 5 plastic bags as my carry-on luggage. What would happen?
I understand this may be a bit silly question, just want to know if security checkpoint has a role in airline carry-on luggage allowance policy enforcement.