Suicide by Cop
My sympathy is with the Cops on this one. I don't expect a cop to be able to analyse a circuit (breadboard or otherwise) in a high pressure situation from 15 ft away. I do however expect a cop to kill a suspected suicide bomber before they take out innocent people. Airports are not the venue for counter culture whimsical behaviour. If the cop had shot her it would have been on their conscience for the rest of their life. Just because she wanted to be creative.
The following scenario happens all of the time:
<Security> "Sir do you mind telling me what is in your bag?"
<Whimsical Student> "A bomb" (laughter)
<Security> "Don't be silly I can clearly see that its just a breadboard with a few wires, a battery and a lump of playdoh! You crazy students really need to get some new jokes.. I will however need to confiscate your nail clippers".