Many of the guys who are happy after passed their articles from Copyscape, they must think about other service to recheck the articles. From my experience i scrape one article and spun it than i checked through Copyscape and its showing it is passed, now then finally I checked through online services and find 3 lines in the articles are found duplicate by google.
So I suggest you to always use online services like the one I am currently using -
http://smallseotools.com/plagiarism-checker/ and one is paid plagrism.com.
I passed my articles from all 3 services and then post to somewhere, where I need.