Reply To: Using Original Parts
In my band handbook, I made it clear that the students were responsible for their band music the same way they were responsible for library books. If the sheet was returned in an unusable condition (e.g. if it had been written on with pen and/or permanent marker), they had to pay for a replacement. If it was damaged but usable, a fine was levied depending on the amount/type of damage.
Parents and students signed a contract agreeing to abide by the rules in the handbook.