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I also did this in Ohio in the early 2000s. Was an interesting experience. 1 of the 4 of us were so miserably hung over, he ended up being a control and not drinking, heh.
I actually did this once in Ohio. I had a friend that was in the academy and they had a few volunteers. They even bought your drink of choice.  They kept track of how much you drank and what times. Then throughout the evening they would do field sobriety tests and breathalyzer. The weirdest part was I had to have my friend come with me any time I left the room to go pee. It was actually really fun. At the end of the night I was dropped off by the local sheriff.