As an adjunct professor, I teach a physics laboratory class on a Saturday morning at a public university. I have taught the class a couple of times and every semester students are perpetually late. There is the occasional student that has had car trouble etc. which is understandable as it is once during the semester, however, most often I have students that are repeatedly late. By late, I mean at times up to one hour (the class is three hours). I was wondering if any of you have dealt with this issue? If so, how do you handle it? I have also stressed the importance of showing up on time. I generally make them complete the labs on their own if they are extremely late and have hard cut-off at the end of the third hour, which generally results in a poor score on a lab report. Still, even with these measures, it occurs regularly. Any advice or suggestions will be appreciated.