I have brought small tubs of playdough a bunch of times since the liquid security rules have gone into effect and never had them confiscated. However, I would not be surprised if that did happen, there is so much variability with the TSA. Just get the little containers (under 4oz) and put in your child's liquid zip lock bag and you should be fine. However, bring lots of other stuff (sticker books, crayons and coloring books, travel games, pipe cleaners, leapster, portable DVD players, etc.) so your kids will have back up toys just in case.