No person shall secure or attempt to secure the sale of any school instructional materials in any school district by rewarding or promising to reward any teacher or by securing for him any position in any other school. No person shall offer to give any emolument, money or other valuable thing, promise of work or any other inducement to any teacher or school officer for any vote or promise of vote or for the use of his influence for any school instructional materials to be used in this State.
     This section does not prevent any person from submitting, or any school officer or teacher from receiving, a reasonable number of copies of printed instructional materials for examination with a view to obtaining information as to the book or series of books for which such officer shall give his vote.