Yeah I agree it wasnt like the mother was a junkie although we dont know how she kept them, kids are smart if they want something they'll get inventive. Also this kid may have seen her mother injecting herself and thought it was normal, or wanted to be doctor for a day or something. She wasnt automatically doing it to hurt someone on purpose, although its dangerous we dont know why she did it. I totally disagree with handcuffing children thats only going to make them worse not better.
My cousin stuck a knitting needle in my brothers ear once, he didnt mean to hurt him he just didnt know better.