Vanderbilt University police in Nashville say they discovered the singer slumped behind the wheel of his car, which was parked and running. Police report that Mark was unable to take field sobriety tests. They add that while being booked, Mark, who is a diabetic, refused to allow blood to be drawn without his personal doctor present. The 51-year-old singer was released Friday morning on $1,500 bail. Mark’s 1990s hits include “Even The Man in the Moon is Crying” and “Born to Love You.”