The LE was talking too fast and BK's voice was too faint for me to really hear much without doing a full-on transcription, but I swear I heard BK say "WSU".
If he knew WA/ID LE were looking for an Elantra, would he have volunteered that he was coming from that vicinity?
Then I heard the cop say "Trooper?" with a question mark, and then a moment later I heard "County". My interpretation: I'm guessing that this was the 2nd stop by law enforcement (assuming BK didn't invent the first stop) and that BK mentioned the earlier stop to this cop, who questioned the earlier stop having been made by one of their ISP troopers, and then they must have established that the first stop was made by a County Sheriff's Deputy rather than an ISP trooper.
All MOO and speculation, based on what I think I heard during a single playing of this video. Subject to change