The controversy over wireless devices in the classroom moves to Peel this morning, Canada's second largest school district.

This is the first day of Peel's new policy of B-Y-O-D, encouraging students to "Bring Your Own Device" to class.

But some parents, teachers and even doctors are warning against the policy, for health reasons.

Parents will start a campaign at a Peel District elementary school this morning, supplying information on the health risks for children who get too much exposure to wireless radiation. 

A former president of Microsoft Canada is spearheading the event as part of a nation-wide wireless safety campaign.

"Parents deserve to know that wireless radiation can cause a wide range of symptoms including headaches, nausea and racing heart rates," said Frank Clegg, who now heads Canadians for Safe Technology (C4ST).

Two years ago, the World Health Organization declared microwave radiation from all wireless devices to be a possible carcinogen, in the same category as DDT and Lead. Since then, Ontario's two largest teachers' unions have called for fewer wireless devices in schools, citing health concerns and distracted students.