Covid 19 coronavirus: Three out of 20 people use QR code at Rotorua mall entrance on day one of level 2 15 Feb, 2021 06:46 PM 4 minutes to read Three out of 20 people signed in with the QR code at the Amohau St entrance to the Rotorua Central Mall in a 15 minute period. Photo / File Three out of 20 people signed in with the QR code at the Amohau St entrance to the Rotorua Central Mall in a 15 minute period. Photo / File A tracer app expert has slammed New Zealand for its lacklustre Covid-19 tracer efforts and says no one is immune from the potentially deadly virus.