Never had anything medical questioned anywhere in the world.
I've never been searched other than returning to the US or communist countries.
Most of the US searches have been purely ag related--they didn't care about anything that their x-ray didn't show as organic.
Going back farther I can't recall details but one does stand out that doesn't make too much sense in hindsight: They opened our bags (my mother--blind--and me {17 at the time}) and the first thing they found was a big seed pod. The bag had been packed underneath a big tree, we didn't notice it add the seed pod. The customs guy laughed at our depiction of the tree's behavior, disposed of the seed pod and didn't even look farther into it--just said to get rid of any more if it managed to slip more in.