A boy at a Davis, Calif., high school says he was one of the students who bit into a sugar cookie laced with the cremated human remains of a classmate's grandparent.

Andy Knox recounted the Oct. 4 incident at Da Vinci Charter Academy to KCRA:

"Two weeks ago, I was just about to go into my sixth-period class, environmental science, and a girl who was also in the class stopped me and asked me if I wanted a cookie. And I knew her, so I figured, 'It's a cookie, why not?'"

Knox said he only took one bite.

"She told me there's a special ingredient in the cookie ... I thought that she put drugs in it or something. So I asked her if like, 'Is this a weed cookie or something?' And she said 'No.' She said it was her grandpa's ashes. And then she kind of laughed. And I was really, I was kind of horrified.

"If you ever ate sand as a kid, you know, you can kind of feel it crunching in between your teeth," Knox said. "So, there was a little tiny bit of that."

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Davis Police Lt. Paul Doroshov told the Associated Press that interviews with nine students and other supporting details that he declined to disclose led him to believe that the allegations of cookie contamination were credible. Police, however, do not know why the girl and a friend baked the ashes into cookies and passed them around.

"They're juveniles and it's not a heinous or serious crime," he said. "There was no public health risk either."

Other students were informed that the cookies contained the ashes of the girl's grandparent — originally reported to be her grandmother, not grandfather — before they consumed them, police said.

Doroshov said police are allowing the school to handle the matter.

Principal Tyler Millsap said in a statement posted on Facebook those who were involved "are remorseful and this is now a personal family matter."