The article says they “tracked” his trip as he drove east. I’m skeptical they lined up a group of ground and air resources to literally follow him 2500 (or however many) miles to PA. That would take massive resources.The article states BK's father flew out to Idaho and accompanied BK back on the drive to PA, arriving in PA around December 17, according to BK's public defender. The article notes that police closely followed the vehicle on the drive back to PA. MOO- this indicates the police before around December 14 (assuming 3 day drive to PA) already knew BK was the POI/suspect. Likely were hoping to find him disposing of the knife at some point, IMO. It appears the police were surveilling BK for almost 3 weeks before the arrest-JMO. Kudos to LE for holding their cards very close, despite the Public hue and cry...really well done on the part of LE.
I wonder if they “tracked” him using a gps tracker, his phone, etc.
But maybe they did literally physically tail him. But to my mind, if they did, that’s much more than 4 days of “surveillance.”
I also saw (cnn I believe) that he was at an auto service shop with his dad and the car in PA, and while there conversed with an acquaintance on CNN. So it sound like he was there at least by the 16th.