My husband gets so tired of hearing the forensics of different cases and doesn't get my interest at all. I told him about this case and how I do not get how these guys (generally men, some women too) plot these things in advance and then not only have unexpected issues arise, but the plan itself was horribly faulty. There is so much information out there on forensics and how LE proceeds, not to mention detailed accounts of how all the others before them got busted. I would expect a much better plan.
Messing with the furnace during the winter and killing the entire household with carbon monoxide would be much easier and less likely to be caught. Your fingerprints on the furnace would prove nothing. It is your house, you have touched it. It has been acting up, you tried to fix it. Of course your prints are there. Things that happen in real life, horrible tragedies..... not things that happen in bad movies like a phantom stalker who writes letters for months in advance and leaves messages on the wall. Is this stalker a frustrated writer? I mean really? That is about as plausible as the nanny who takes your kid and leaves you a script to follow.
It must be a narcissistic personality trait that would let someone believe they are that much smarter than the rest of the world.
The police are handling things quite well from what I can see. They need the tests to come back before arrested him. There are no witnesses, no excited utterances, etc.... they need real probable cause before taking that step. It is glaringly obvious doesn't count in court. If they arrest him too soon and a well funded defense attorney can argue that the arrest was made without cause it would be a disaster for the state. Lab tests take time to run. In our crime riddled society the labs are flooded with work and backlogged. This is hardly the only set of forensics LE is waiting to come back.