A substitute teacher who smoked pot in a Massachusetts classroom won't be asked back as a fill-in educator.

The principal of North Attleborough High School confirmed to WCVB-TV that a sub who smoked marijuana in a classroom full of students Monday has been fired. In a statement, Principal Peter Haviland lauded the students who promptly told him about the incident:

"It was their quick decisions to report the concerns which allowed our school to immediately intervene and remove the individual who created the unsafe environment," Haviland said in a statement. "We are proud of our students and grateful to them for the level of maturity and courage they showed during this unfortunate and unprecedented experience."

Haviland added that the incident was not typical of the high school.

"The incident ... was entirely unexpected and unprecedented and it was in no way a reflection of the great students, faculty, staff, and families of this great school and community," Haviland said. "Instead, the quick actions of the students to report their concerns is an accurate reflection of the values of this school and community and serves as comforting evidence demonstrating that our students share and uphold these common values of safety and appropriateness within our school."

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and saying it was an isolated incident.