1. If the TSA Officer actually took a report and collected ID from you, you are not out of the woods. The decision as to whether to propose a fine is made at HQ, not at the checkpoint.

2. It could be that the checked luggage search was random or triggered by something harmless, but it could be that your bags were pulled after the knife incident. No way of telling.

3. You will find out if you've been added to a watch list the next few times you fly. Don't make a big deal of things, just go with the flow and watch what happens. Give yourself extra time until you've assured yourself that you aren't being subjected to extra scrutiny.

4. Needless to say a "second offense" won't be taken lightly. You will need to do a self-inspection to make sure there's nothing untoward in your checked or carry-on luggage for the conceiveable future.