I know it's implied in your comment, but I hope that upon discovering someone was playing Netflix at home and not watching it, that the conclusion is still only "he was not at home while his Netflix is playing" and not "he put on Netflix to premeditate a murder." If he lies and says he was at home then that's perjury, which only may be evidence of premeditation.

I know this whole thread was tongue-in-cheek, but when someone's life is on the line for murder you do need to remember that you're trying to prove that a person did it, and it's not sufficient to disprove the ways that they didn't do it.

Well, yeah, but the phone is going to tattle anyway you look at it. Frankly, the advice is more useful to people who are worried about being tracked than an idiot planning murder. I get the feeling a domestic abuse case is going to be a better bet to use this technique to buy time to get away before we see someone try to hide a murder. Those child tracking tech items are probably going to be a gold mine for abusive partners.