And I don't believe that children are innocent. In fact, no one seriously believes that. Just go to a playground and watch the kids playing in the sandbox! The romantic notion of the sweet child is simply the parents projecting their own wishes.
As an actor, when you encounter a psychopathic personality, you naturally want to make him 'bigger than life,' as the Americans say.
They also explained how the sensors can monitor the levels of acetone on people's breath, and this can be used to tell people who suffer from diabetes when their next insulin shot is due. This is a more discreet method than what is currently on the market.

