EZ4 is it for real?

Factual Questions
1

I was watching “Close Encounters of the Third Kind” last night and there was a part where the military sprayed a bunch of “EZ4, a sleep aerosol”. Is this stuff for real? What is it? Why don’t they use it more often in riot situations, etc?

2
      • I have never heard of solid (powdered) respiratory-deliverable tranquilizers.
  • Medical respiratory anesthetics are gas mixures; most (if not all) of them are flammable/explosive. - MC