gluten free products

Question

My son who is 8, has celiac disease. He is on a gluten free diet ,no grains allowed,(wheat, barley,rye, spelt,oats,malt). We only buy him crackers made of rice and corn,gluten free from the health shop.Can he eat the same ones during pesach,since they are not contaminated with other grains? This is our first pesach since he was diagnosed,so please give us an answer, since he is so restricted. Thank you. Susie Dellal.