I am currently in a walking boot because of extreme tendinitis throughout my right leg from my foot to my hip. I am on a trip right now, and as my physical therapist couldn't come with me, she prescribed a boot because of the amount of walking that I will be doing. Leaving DEN in the US was no problem. They just swabbed the boot and it was a quick and easy process with TSA. I flew into STU in Germany, still no problems. At customs I was asked to step aside and explain the circumstances for said boot; no problem. Left the airport and was in Stuttgart Germany for 3 weeks with family. Arrived back at the airport this morning to fly on to HAM Germany. Security was a problem this time. TSA states that you don't have to take off the boot, but I was A. Not under TSA jurisdiction and B. Also a German citizen that has to abide by citizen rules. As a minor I was sat down and asked to explain the boot again; no problem. Then they told me to take off the boot. I began to take off the boot, and as soon as I took the top strap off and released the air cast I was met with pain. I sat up and told them that i was not going to further take off the boot, and that they could take a swab. I was greeted with hostility and was told that if I moved i would be forced out of the airport and to wait for her to return. The attendant then proceeded to get the police involved because they "had" to guard me. A 15 year old American-German citizen. Ok fine. I sit there and wait. And wait. And wait. All the while having a police man with a semi-automatic weapon 4 feet away from me. Finally I had had enough and started to take off the boot when the police man sternly asked me what I was doing. I'm doing what you people originally wanted me to do, I said. They then swabbed the outside of the boot not the inside, tested it, proceeded to tell me that it was free of explosives and that i could put it back on. Overall a completely different experience than that in the US. Be aware of the policies in the airports you will me traveling to, and inform yourself. That's all I have to say.