ID incoming posts as syndicated?

I’m assuming this is no longer relevant, but in case anyone else is curious.
You can always tell google to not to index the page by adding the meta tag in the header of the post:
<meta name=”robots” content=”noindex, nofollow” />
Naturally you’d have to have access to the theme files. Run a conditional statement, if it’s in a specific category (where posts are syndicated over), then add the meta tags.