
Quoting
cbg
You're not asking the right question. The answers to the questions you have asked are:
1) No
2) Yes
This assumes that the employees are aware of the policy you mention in your first sentence.
The question you should be asking is, Can an employee be singled out for enforcement of policies that other employees are not held to? The answer to that question is, Yes, unless the employee is being singled out BECAUSE OF their race, religion, national origin, sexual orientation etc.
Now, my question to you is, who are you in this scenario? It makes a difference how I recommend you proceed. (NOTE: this is not being asked as a mind-your-own-business response; I have specific suggestions as to how you can best help the employee but which one is best for you to use depends on whether you are co-worker, manager, family member, etc.)