Just an FYI, one of the ways I spot a stolen content post is something that looks so well written it might be professionally written is to use google search.
I take a sentence that looks like it hasn't been "spun" (key words changed to avoid detection) is to put it into Google search with quotes around it. If it comes back with any matches I look at them and see. You can also search by photo in the images tab of google and this will find most stolen content real fast. Just right click on a photo from a post and get the photo location info and paste that into google and it will tell you what pages that photo is on.
Maybe I should make a post about this topic as it's one that is hard to see sometimes.
Heck look at this post
This jackass took my comment from here and posted it as his own post. If @erodedthoughts hadn't pointed it out to me there is no way I would have ever known about the theft and he would have probably gotten away with it. Instead I looked at each of his posts and everything is stolen content and removed all rewards from him.
Anyways in the end there is no question that stolen content will end up entered into the contest. Some is so well "spun" that you can't find it easily and others just doesn't look stolen so you wouldn't even think to check.