I'm going to France. Can I bring cooking knives, Adderall, or vodka with me on the plane?

Yes, you can check your knives. Disclose them. Of course you can take your prescription, if the bottle has your name on it. There's a limit to how many ounces of liquid you can take on the plane; I think it's 4 ounces. Call the airline to be sure. The other person is just wrong.