I always travel a drinking box since fo rme this is the most quickest way of dealing with a low. No they don't "normally" allow you to take one past security but this is what I found out. While going through security take it out of your carryon. Tell them directly you/child are diabetic..and that should be enough to let you take it through. They may still swab and check it out but in the end you still have it. Take some skittles as well since they travel well and are good back ups. Only once going to DR did I have a "disagreement" but I won.