Two students from the University of Colorado have been arrested after serving pot brownies to classmates and a professor on Dec. 7, reported the Associated Press.

The history professor reportedly became dizzy and complained of losing consciousness, according to university spokesperson Ryan Huff, reported the Daily Camera. One student’s mother claimed her daughter went to the hospital after suffering an anxiety attack. Overall, three were hospitalized and five others claimed they became ill.

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The two students who served the brownies, Thomas Ricardo Cunningham and Mary Elizabeth Essa, affirmed that they had marijuana in them.

While Colorado recently legalized marijuana possession, it is still illegal to serve it to people without their consent.

[Image: A picture of brownies via Flickr user Cristiano Betta]