Unfortunately I have a broken arm. The two times I flew out of LAX (not OGG, LAS, SNA, etc) they had to x-ray the cast. They take 4 "pictures" to view all sides of the cast. The x-ray is strong enough to see the bones. I asked the TSA agent why only LAX, she said that any airport that has the machine has to use it. I asked her how safe it was, she said it can only x-ray the cast. When I showed her the bones in the x-ray, she just smiled. How can I find out if this is dangerous and if I have the right to ask for a swab (as in the other airports) instead of the x-ray? I know this isn't a common question but when you never know when you too could trip over luggage on a German train and break your arm. Thanks for any information.