One of the key pieces of evidence will be the boots he was wearing when he murdered her. In the video of him approaching his home, his clothing is stripped down. He's not wearing boots, nor is he any longer carrying anything. So, did he discard the bloody boots on his way home (like his jacket, etc), and return at another time to retrieve the boots and then, place them in his own trash can?
Also, why didn't NYPD remove them directly from his trash can, rather than wait until sanitation put his trash into their truck? I thought once items are discarded in one's trash, that's it. LE is entitled to use what they find as evidence against you.
I suppose they are not taking Any chance of this key piece of evidence being thrown out which is the way to go if he goes to trial