A vegan middle school teacher in Illinois will not going back to class until the school stops serving milk and meat, he said.

Dave Warwak has been a teacher at Fox River Grove Middle School for eight years.

The 44-year-old became a vegan in January and believes the school is "feeding poison" to students. He also believes the school's posters featuring milk are wrong.

Warwak won't return until the posters are removed, he said. He's looked into filing child-endangerment charges because he claims it's wrong to promote animal products as part of healthy diet.

Warwak was asked to leave the school last week because he talked about animal-cruelty issues, he said.

The school's superintendent, Jacqueline Krause, said Warwak wasn't fired.