If a manager can’t tell if an employee is doing their job or not, they deserve to get bilked by an overemployed person. I can’t care at all about what some other person is doing or not doing unless it directly affects my ability to do my job.

Should we also ban sick leave because a few people call in sick when they gasp are not actually sick?

If sick leaves are abused, you better believe actions are taken, including parting ways.