My 11 year old son has a math teacher that appears to be very arrogant and sarcastic. I hear from other children that it is worse with no parents around. I would like to know exactly how this teacher treats these children in class. I am not looking to get the teacher fired or any other trouble. I just want to know if they are actually learning in this atmosphere. Is it legal to send a voice recorder to school with my son? Do I need permission from the district, school or teacher? I really don't want my son to get in trouble for my concerns.