Making it compulsory to scan QR codes on the Covid Tracer app has been put in the too hard basket by the government - for now. Significant stumbling blocks have been identified - in particular too many people unable to use the app and problems dealing with tech giants like Apple and Google. Other countries have also run into difficulties trying to make their apps compulsory, due to privacy concerns. However the ACT Party is still pushing for the government to forge ahead. Here's political reporter Charlie Dreaver with the details.