Ivor Cummins: "The introduction of mandatory masks had no effect on the R value curve" (24th July 2020) More Ivor Cummins, biochemical engineer: "In all the countries so far, it's quite clear the introduction of mandatory masks had no effect on the R value curve". Cummins told talkRADIO's Mark Dolan: "If anything, masks are extremely weak". Links Link To Youtube video Ivor Cummins