It's late and the mind is getting "inventive".
What's needed is a pepper spray grenade.
Imagine a heavy cardboard tube about the size of those "traveller" size shave cream cans with a 3 second fuse. Pull pin, release spoon, lob near subject - Boomph! A six-foot by six-foot cloud of OC blossoms from the container.
"911, what is your emergency?"
"There's a gas thief at 123 Main street who needs a ride to jail."
"Do you have him in custody?"
Nah, no need. Arriving officers will recognize him. He's the one trying to bathe in 1/2-inch of gutter water."