I recommend employers listen to a podcast from Jason Storipan of Stark & Stark concerning Attendance Control Issues for employees. Please remember that laws do vary from state to state but much of the information given in Jason’s podcast is applicable to all employers even if you are not located in New Jersey.
If you are developing policies and procedures to deal with employee attendance issues be sure to contact your employment lawyer and keep in mind two important ideals: Fairness and Consistency.
If you treat people fairly and in a consistent manner your liability risks from an employee lawsuit decrease dramatically. May seem like common sense but as George Will said, "This is an age in which one cannot find common sense without a search warrant."