Ind. Code § 20-27-7-4

Sec. 4. A school bus may not be used to transport passengers unless a valid certificate of inspection issued under section 3 of this chapter is displayed as viewed from the outside on the lower left corner of the windshield of the school bus. However, if the left corner position obstructs the school bus driver's view, the inspection sticker may be positioned on the bottom of the windshield so as to minimize the obstruction to the school bus driver's view.