This was one sad experience for me when I was assigned as the in charge of the warehouse that is the storage of used computer equipment. I didn't know that the warehouse staff were doing magic with the attendance that no one was coming in late and worse there were no absences. It was a big issue when I uncovered the scheme of cheating. One worker would come in early and make it appear that everyone had arrived. That was the flaw of using time cards for attendance control.