Now you have me curious. What can you do with a shaker full of Potasium Nitrate?
It is part of gunpowder and it is what the search dogs are trained to sniff-out. Make the search dogs go crazy.
BTW, they are running everyone through a metal detector before they enter the plaza. there will be dogs, and they will be going nuts with the trails of potassium nitrate leading everywhere.
Security will be super tight, except near the SEIU goons.
The SEIU thugs are going to get dusted with KNO3.
The bomb sniffing dogs are going to go nuts all over them.