Piggybacking off of MichaelNKat and BroadwayWannabe,
Students are always PERMITTED to come back to the program, but many do not choose to continue on if they receive "failing" grades (mentioned in the previous post) in their core classes. It is rare that a student is not forewarned of declining grades in these important core classes.
That being said, even when students fail a core class or are forced to "withdraw" (before the middle of the semester is up), some of them still graduate. I can think of two in the past who've done it and two who are going to do it this year.
