It was a little stainless-steel aerosol canister that looked for all the world like a pepper-spray self-defense unit.
The cops were running for them, batons out, pepper-spray out.
He turned it and let the door crash open as two cops in riot-visors came through, pepper-spray at the fore.
a liquid of oleoresins from capsicum put in aerosol form to be used for self-defense against an attacker
Pepper spray is highly irritant to the skin and mucous membranes.