Just an FYI, it is a violation, though a lot of people don’t realize that. Way too many people think of diabetes as a diease … an inconvenience. It is a disability according to the Americans with Disabilities Act. Your endocrine system doesn’t work correctly, and this puts your life in danger if you don’t have the supplies that you need. What those supplies are varies depending on the type of diabetes and how it is treated, so getting some kind of official note is usually needed if you need to ask for “reasonable accommodations” to be made.
Personally, I don’t hesitate to point out the fact that it is a disability. As a security officer (private security), I know that part of my job is to be sure that everyone at my site is as safe as I can make them, and that includes helping to be sure that anyone with a disability gets what they need to function and be safe. Generally, it’s someone else’s actual job, but I might be called on to help. I don’t ever want to be called on to explain why I contributed to a situation that put someone in danger.