Because covid spreads via aerosols, not via droplets. If you could smell a perfume, covid is transmissible. The shielding was just a pice a plastic hanging fro

Because covid spreads via aerosols, not via droplets. If you could smell a perfume, covid is transmissible. The shielding was just a pice a plastic hanging from the ceiling, not some kind of box. So the cashier was breathing the same air as everybody else.