It comes in pretty colors and shapes. It's a popular party drug, sold by people one tab at time, often shows up it clubs. It would like like candy to a 3 year old if she found it in her mom's car. It would explain the silence of Casey's friends as some of them could be dealing it. It has killed children before and some young adults as well. It would the kind of 'accident' that you wouldn't share and the question of the source would most certainly come up in an investigation of a small child's death.