WCVB Boston has a video of the mayhem inside the prom.
Three students at the North Andover High School junior prom were sent to the hospital as a precaution Friday after alarmed chaperones, including the school's principal, saw that the teenagers were sick and called 911, North Andover Superintendent Chris Hottel said in a statement.
Students were sent home early and were leaving the building, even as latecomers were still arriving.
The culprit? Marijuana brownies, according to police. After investigating, police and school officials said they think almost a dozen students may have knowingly eaten the illicit brownies before heading to the prom at the Atkinson Country Club in Atkinson, N.H.
"Eleven students were eventually interviewed at the prom as possibly having received a brownie," Hottel said.
Atkinson Police Chief Philip Consentino said the students probably knew the brownies were laced with pot. "I'm leaning toward the assumption that they knew what they were doing," he told The Boston Globe. "Where the brownies came from, who had them, we're not sure."
In a phone interview today with AOL News, Consentino said police in North Andover had taken over the investigation, since the students ate the brownies in Massachusetts and no crime was committed in Atkinson.
North Andover Police Lt. Paul Gallagher did not immediately respond to a request for comment from AOL News but told North Andover Patch that the investigation into the baked goods was ongoing. No charges have been filed against the students so far.
Hottel warned that the students involved will face disciplinary action at school. "When you do things, they have repercussions," he told the Globe. He did not immediately respond to a request for comment from AOL News today.