N.J. Stat. § 18A:40-8
The principal may, upon the recommendation of the school physician or the school nurse, if either of them are present in the building, exclude from school any pupil who has been exposed to a communicable disease or whose presence in the school room certified by the medical inspector as detrimental to the health or cleanliness of the pupils in the school, and in the absence from the building of the school physician or school nurse, the classroom teacher may exclude the pupil from the classroom and the principal may exclude the pupil from the school building and the principal or the classroom teacher, as the case may be, shall notify the parent, guardian or other person having control of the pupil of the reason for his exclusion.
N.J.S. § 18A:40-8