One more in the "never been stopped" group.

Mine is a statdose system that is sort of like an epipen but has two liquid filled chambers/injectors that you select with a wand thingy. It all sits in a plastic box flip-top as the "system."

No one has ever asked about it, it's never come out of my carry on roller, nor have i bothered to take the spare emergency set out of the pocket in my laptop case. Never had a problem.