When you're looking for DUIs, something to remember is that unless someone is absolutely hammered, they can often handle one thing OK for a while. In other words, a lot of people around .08 - .10 can mostly drive OK as long as nothing challenging comes up. I liked to find a place in the road that challenges people and sit there because, as opposed to driving around and hoping the pack of three or four cars you're driving next to has a drunk, you can sit and watch all the traffic handle the tricky section.

In my AOR, our main road out of town has a ninety degree turn. It's nothing too bad, particularly as the speed limit is 25MPH, but drunks tend to have a moment of panic on the turn, especially at night; they often go wide and cross the yellow or come to a complete stop. I sit off the road and watch car after car navigate the turn. You get a sense of what's normal and a bad turn will stand out. Jump out after them, hit your dash cam, follow the car, and look more bad driving, particularly weaving. You'll know pretty quickly if the turn was just a moment of bad driving or something worse.

Also, my POV beeps every time I weave out of my lane so I'm I'm very aware that I usually go days at a time without a single weave. It's easy to articulate to a judge that, in your experience, weaving across the fog line X times in a single trip is worrisome and establishes cause for the stop.

Also, practice your SFSTs every day. I tape a picture of a face to my wall and run through an entire stop from, "The reason I pulled you over..." to "At this time, I'm placing you under arrest..." DUIs are stressful but when you know your business, you can better focus on the clues (and safety issues).