Originally Posted by janetdoe

It may sound absurd, but here is what I would do:

Pack it in your checked bags; put the original unopened container in a plastic quart or gallon baggie, with a copy of the therapist's instructions in the bag. Put it on top of everything else in the luggage, so when they open the luggage, it will be the first thing they see and they won't have to paw through your undergarments. Don't pack anything valuable in the bag, with the Play-Doh if you can reasonably avoid it. I wouldn't pack any electronics or cords in the suitcase with the Play-Doh, either, because that might make it look more bomb-y.

Personally, I would also seal the luggage shut with a zip tie, so I could verify whether or not anyone opened my bag; if so, I would check it for missing items before I left the airport.