FBI are involved due to the multiple jurisdiction aspect and much needed resources?
In regards the DNA, the perpetrator has entered the 'private spaces' of two separate bedrooms which has left fresh markers. There are alleged defensive wounds.
The perpetrator might have visited one bedroom in the past, which I doubt, the perpetrator has entered another. There are fresh DNA markers everywhere in private spaces.
Xana and Ethan got home at 1.45 so they could have been targeted earlier.
Kaylee and <mod note - Maddie> went to a bar.
Both Ethan and Kaylee were not resident and overnight stays, although being weekend, they had more propensity to be staying overnight.
The fact the attacker has entered residence where the victims will be found iand the DNA preserved in a non hostile environment s a high level of confidence, and the person is no on LE database.
Do the military keep a DNA database for all soldiers as an identifier mechanism? Maybe they can run that database, unless the soldier is from another nation?
The knife is common. The knife is desivned for this purpose.
The car police are seeking is a common non descript vehicle which has already been confused with other vehicles of similar shape. The vehicle is white which is the most popular car color. The vehicle is not only mass production but holds similar attributes to other vehicles already confused by sleuths. The car has capacity to blend in, especially at borders.
Kaylee, <mod note - Maddie> - Ethan and Xana were home
To enter the house with a teenage male occupant suggests someone with a medium build and some training. If it goes pear shaped the person could face objects etc.
Possibly an external witness to sight if another person had awoken to inspect the commotion
I would run a military DNA database for veterans also, being mindful the perp could be foreign IMOO
Material facts here:
King Road Homicides | Moscow, ID