The shield-free green code can improve the detection efficiency and reduce the risk of infection while eliminating many complicated processes such as printing, carrying paper health certificates and scanning codes. However, due to the lack of screening and sampling methods, it is inevitable that there will be a small number of missed tests, and there is a possibility that the actual health status of people using green codes does not meet the standards.
Shield-free green code has been widely used in many places. For example, in airports, high-speed railway station and other convenience stores, restaurants and other places, staff only need to look at the green code to let people in and out, which is more convenient and efficient. However, it should be noted that although the shield-free green code can bring convenience to people, it also needs to be improved in system and technology to make people feel more at ease.