I recently went on a flight in the states, put everything on my carry on bag, needles syringes, and vials they never said anything to me, I even checked with the person at the counter, I told them I had syringes and needles. They said its not problem, diabetics bring that stuff on the plane all the time. Granted I'm on TRT and I have rx for it, so it's not like they could take it from me anyway.