Did they check the child for GSR ? Things that make me go hmmmmm .
Maybe a detective or crime scene person can chime in, but my understanding is that do not perform this test anymore. There were too many anomalies and they were testing positive for other items. My limited unstanding is that they are no loner admissible in court, so they are no longer attempted in the field. Could be wrong though.
Tragic incident, nonetheless!