So today, please take one minute to explain the new realities of officer/child interactions. Can't hurt. Oh, by the way, this advice applies to all of us. When I'm 90 I'd respond, respectably, "NO." Then if the officer responds like, "Oh, well why not?" I'd say something like I don't have time for this nonsense, I already said there isn't anything illegal in the car so you'd just be wasting taxpayers money.
Please, sit down with your kids and take a minute or two to explain this.