Ticked, Not Tested, Explained: Dagny Okafor, Ingeborg Nwachukwu and Casimir Beng on whether a warehouse's oral food-safety tick predicts what workers still know three months on Resolving to Ticked, Not Tested, Explained: Dagny Okafor, Ingeborg Nwachukwu and Casimir Beng on whether a warehouse's oral food-safety tick predicts what workers still know three months on…