Since diabetes can be either Type 1 or Type II, there are certain requirments that each provider must follow in each state and EVERY single state differs in those rules and regulations.
As Sharlan mentioned, California does NOT allow child care providers to administer insulin or glucagon injections where as Minnesota does allow it.
I also think that having diabetes, as ohters have stated, doesn't automatically mean someone is disabled therefore, not always having to follow the rules and guidelines of the ADA.
I know from experience that having Type I diabetes is a whole different ballgame than having Type II. Each requires a completely different type of care. Then if you add having an automated pump, the rules again would be different. So I would automatically assume that different rules/regulations would apply in almost every situation.