Covid 19 coronavirus: Calls for tracer scanning to be compulsory after latest cases didn't use app 17 Feb, 2021 04:33 AM 5 minutes to read NZ COVID Tracer app overview. Video / Ministry of Health Social issues reporter, NZ Heraldmichael.neilson@nzherald.co.nz That the latest Covid-19 cases had not been using the tracer app was "quite typical" to the rest of the country, says an expert who is calling for a new approach targeting high-risk areas. While it had previously been reported the three cases were not "regular users" of the app, on Wednesday in Parliament Prime Minister Jacinda Ardern admitted definitively they had not been using it.