Coronavirus - new mask guidelines

There are lots of news articles about the CDC's (Center For Disease Control And Prevention) new guidelines about wearing masks. Here are examples:

https://www.nytimes.com/2021/05/15/us/cdc-mask-guidance-americans.html

https://www.usatoday.com/story/money/food/2021/05/15/starbucks-mask-policy-update-may-17-optional-vaccinated-customers/5100124001/

https://www.nytimes.com/2021/05/15/world/nurses-union-cdc-mask-vaccinated.html

Saturday Night Live satirized the new rules. 

https://www.nbcnews.com/pop-culture/tv/saturday-night-live-satirizes-sometimes-confusing-no-mask-guidelines-n1267515

Obviously the new guidelines rely heavily on voluntary compliance. They are very difficult to enforce. Is Walmart or any other place going to ask for proof of vaccination if a person is not wearing a mask? How would the enforcer know if the proof of vaccination is fake or borrowed or not? If a person walks in with a mask, is the person going to be watched to assure the person doesn't remove it?