I always laugh when I see the tv cops argue "this is MY case, this is MY jurisdiction". In real life, when you've got a dozen open cases (detective) or 5 pending runs (uniformed car) and someone says that, you usually say "cool, its yours, see ya".
If ISP is 10-41, many like to hand off DUI's to them. They have "performance standards" that others don't so it can help troopers that have a harder time making contacts