You do not need a student id to use a student ticket as long as the ticket has been "validated." To validate the ticket, you (or the student) need to go to the ticket office and pay the difference between the student ticket price ($21) and the face value of the ticket to the general public (which is $55 for the first 3 home games and $65 for the VTech game and all other home games). The ticket office then puts a sticker on the ticket to show that it has been "validated" and can be used by non-students.