Hello...I understand your frustration and maybe the school should have been more tactful in their response to your son's behavior, however I also understand them not wanting to take the responsibility of bringing your son if he does not pay attention to instructions and presents himself as a disruption for his saftey purposes only...Your school may not have the resources avaiable to give your son the attention that he needs and may fear that he could possibly become a liability on a trip....The correct response for the school should have been to voice their concerns about his saftey and then suggested that perhaps you did attend....If you are able to go on the trip with him then there should be no problem what so ever..If the school still refuses, then this may be discrimination....I would let the school know that you did not appreciate how they handled this matter, but keep the blazing gun stored in the chest

Just let them know that you do want your son to be treated fairly, his disability should not disenable him from attenting any trips and that you are willing to work with them towards your son's best interest!!!!
Marissa