In my experience, those students with better attendance achieve higher grades. Having someone sign the attendance record for you or signing it for someone else is cause for failing the course. Late arrivals will not be permitted after a five-minute grace period without advance permission. The student should sit by the door and slip out as unobtrusively as possible after being acknowledged by the instructor. The reason for this policy is that the late arrivals are distracting to the class and instructor.
Valuable time is lost by the entire class.
Ideas are to be freely exchanged. Once an idea is expressed the idea is fair game. But the person expressing the idea is not. Please consider the feelings and thoughts of the individual before commenting on the idea. This is tricky.