[ISOC_KE] A simple security question

Apologies for cross-posting. This is a non-ICT related issue, but touches on people's security. Someone help me out. This is just a hypothesis: Let's say I'm carrying an IED in my back bag and attempt to enter a supermarket, the guard, with a metal detector, rolls the detector on me, asks me what I have in the back, and I say, Laptop. He lets me in. Do the security guards have training on handling bombs, or once a blast takes place, they run without looking back Solomon