Determining whether a model was edited outside of Windchill

So if someone is going to modify a model that's in Windchill you have two general options:

1. You can check it out to your Workspace, modify it, then check it back in.
2. You can save the model to disk, modify it on disk outside of Windchill, import it back into your Workspace, and finally check it in.

The first option is what I would hope is done the vast majority of the time.  But I'd like to be able to check for this.  Is there a way you can tell?

Thanks.