It's a gas with barcoded particles. Say you're at a protest, cover your face, evade the cameras, they can find these barcoded particles on your clothes or up your nose using a PCR test they can prove if you were there when this 'safe gas' was released.
It's a gas with barcoded particles. Say you're at a protest, cover your face, evade the cameras, they can find these barcoded particles on your clothes or up your nose using a PCR test they can prove if you were there when this 'safe gas' was released.