Immaterial. The detectives are professionals; their task was finding Danielle and the culprit behind her abduction (now murder).
Until she was found, it would be counterproductive to the potential of a good outcome to investigate or charge the parents. Even if they violated the law (with drug use, for example), with the DA fighting for his career in Tuesday's primary, you can bet he's is going to treat this NATIONAL case carefully so he can ride it to reelection.
Their behavior may be whitewashed by the media firestorm they were able to bring so close to this contentious reelection bid. If the case is settled, we may never know all the facts. You can be sure we'll be seeing a movie-of-the-week and book-of-the-month though.
This is a factor that keeps coming back into my mind. I hope there were no politics pushing this case along. It wouldn't be the first time.
As I mentioned before, rumors in LE circles say that Pfingst is a reluctant prosecutor. That doesn't seem to be the case this time. I don't mean to infer that the evidence didn't warrant an arrest, but it seems like many loose ends remain dangling.