Here are some ways that Ms Stauch may have screwed up:
- Videoing various of her activities (and Gannon's) at times near to when he disappeared
- Loading things into the truck while on neighbors' cameras (plural, MOO)
- Appearing on various cameras in the area where the searches are taking place
- Throwing evidence out of her truck/car, things with DNA on them (blood evidence included)
- Admitting to a reporter that she threw things out of the truck, one of which was bloody wood
- Somehow getting a quantity of Gannon's blood in the home
- Making an urgent call to have the home cleaned or otherwise returned to its state of cleanliness (so that AS wouldn't notice)
- Making a missing poster with erroneous information about Gannon
- Renting a car for spurious reasons when Gannon had only been missing for 12 hours
- Transporting a body in one or more vehicles
- Lying to AS in text messages and phone calls
- Wearing her Apple Watch all day on Monday
- Involving her 17 year old daughter in her alibi
- Being abusive to Gannon in front of witnesses
- Taunting of Gannon's family on SM
- Leaving the state soon after Gannon disappeared
- Not realizing that rental cars have geotrackers on them for just such cases as these
- Not realizing that GPS on the AppleWatch isn't disabled by leaving the phone at home
- Lying to police about Gannon running away (about him being at home between 2 and 3:15)
- Evidence of body fluids/blood in at least one vehicle
- Prior suspicion of abuse by school system likely
- A past history of vengeful behavior and threats to AS and possibly LH
- Ceasing to cooperate with police (interviews) early on in the investigation (probably Day 2)
- Injuries to her hands
I'm sure there's more. This is just my list of reasonably expected outcomes when we see the arrest warrant. I think there will be dozens of objects with either blood or DNA on them. I suspect there will be cadaverine and other components of decomp found on her clothing, perhaps in the laundry, or maybe in the vehicles.