The self-service system does not distinguish withdrawn students; however, the Cobra classlist does retain the information of students who have withdraw from your course.

1. Go to your course in Cobra and click on the Classlist link in the navigation bar.
   

2. On the classlist page, click the Enrollment Statistics button at the top of the page.
   

3. On the enrollment statistics page, scroll down past the stats table.
   

4. You will find the Withdrawals section that will identify every student who had officially enrolled in your course and then later withdrew.  You will see the date they were withdrawn as well as the date they last accessed your course, if applicable.