You can probably get an AO Kershaw at your local Wal*Mart. That doesn't mean it is legal, but it is a good defense.
Knife laws are not written by people that know knives. AO is a new thing, and as far as I know, no knife laws have taken them into account yet (either to specifically outlaw them, or make a specific exception for them).
It really comes down to the opinion of the LEO if you get taken in or not, and then it goes to the courts (who may decide AO is or isn't a switchblade).
AO knives might show up in the laws in about 15 or 16 years.
I wouldn't leave your Kershaw at home just because of what a cop might think. A cop might think your slipjoint is illegal. If you decide what to carry just because of what a cop *might* wrongly think, you can't carry any knife.
I go by the letter of the law. AO is not the same as a switchblade. The law doesn't ban AO knives. They are legal.
If you carry an AO knife the day may come where you get pulled over for speeding and the cop might even arrest you for your legal AO knife. But in the end, you are in the right. And you may have to fight for your rights in the court. We can't just lay back and let knife laws control us to the point that we won't carry something that is actually legal. Know your laws and know your rights- and use your rights.
Like said above, this is not an insult to cops. I actually want to become a CHP officer. But there are so many laws and so many little details that no LEO can be expected to remember them all. There is so much misinformation about knife laws in specific that it is easy for a LEO that isn't a knife knut to think he/she knows the law, but actually have it wrong. As knife knuts, even we have trouble understanding the knife laws sometimes, so to a non-knife knut it can be extremely hard to understand and remember.