Can someone remind me how they came up with the white Elantra to begin with? Witness, surveillance video, or what?
Once they had that, I'm sure they identified a white Elantra from a grad student at WSU, then realized he was no longer in Pullman and began searching. After locating, they surveilled him while waiting for DNA or prints to come back.
We don’t know how LE targeted the white Elantra. They might even have identified him as a prime suspect, first, and discovered that he drove it. Or, video, or possibly video AND eyewitness. I don’t think eyewitness alone, because LE wouldn’t have felt so confident of the make, model, year of the car. (Eyewitnesses notoriously can’t be relied on that much.)
MOO