Hey I jumped in with both feet, closed my eyes, and bought a used FFE from a used car dealer. Granted I had over three years experience with the car, so I kind of knew what to look for.
I'd say phooey on the draw down test. I'm betting no dealer knows how to do that and wouldn't bother with the time to do it. I know there are people here that think the battery degrades a lot and are super worried about that. My feeling is Ford built more than enough protection in the battery to not bother with all that. Just drive the car.
Actually I temper the look the car over with the price. If they are asking a good solid price that is near or below what KBB says it should cost - go for it. If they are charging a premium, get them to do all that stuff - draw down, a brand new 12V battery... whatever you can dream up to push them. Personally, I'd just move along and find something else.
What I'd look for first - a California car. Mileage is totally irrelevant - lower miles isn't necessarily a more valuable car (within reason). These cars can't have many miles put on them - there just isn't enough range. If you're deciding between an older car with more miles and a newer one with fewer and there is a premium for the newer, all things being equal, buy the older car for less money.
Tires, tires, tires - make sure they are good all around. If you are going to replace them, count around $500 for a set. Make sure they all match.
Smell the inside. You don't want a smoker car, unless you smoke. Then you can name your price on a stinky car.
Color - get the one you want. Don't settle for some color you don't like. There are plenty available at good prices.
Walk away like you did over extended warranty talks or other add ons to the car. You don't need any of them.
And I'm not sure CPO is worth it for this car.
Shoot you're going to buy a car that is less expensive than an equivalent Focus ICE. And you aren't spending big pile of money either. So you get two or three years out of driving the car for $9,000 or less. You win big time. If the battery goes dead enough that you can't drive it anymore - well move on.
2014 Platinum White FFE (Turning in mid Dec. 2016 25,000 miles)
2013 Ingot Silver FFE
2012 Titanium ICE Focus
2014 Tesla Model S 85