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that come here, i d still like them to wear a mask until we know what the guidance is. reporter: big chains like target, kroger, home depot, and starbucks are keeping their mask rules too. tom ryan carries his vaccination card with him. i just carry it. just in case. reporter: in case of what? somebody wants to know. reporter: but with no proof required, an honor system now raises new challenges. 64% of the u.s. population is still not fully vaccinated. if you are vaccinated and you are making the decision to take off your mask, then you ve made the decision to get vaccinated and you are safe. if you are unvaccinated, then you have made the decision to take that risk. reporter: but there is pushback. the union representing retail and grocery store employees says the new mask guidance is confusing and could force essential workers to become the vaccination police. i ve been doing this for a year and a half. we ve all been wearing a mask, and it s better to be safe than sorry. reporter: some parents concerned, too. valerie blankenship worries the