How can we screen articles for potential fruad?

Simply Copy a part of the article and paste it in Google Search. Or other good method is to use some tools like https://www.duplichecker.com/, https://smallseotools.com/plagiarism-checker/ etc specifically designed to check plagiarism.
If anyone comes across something suspicious content from a user feel free to give a plagiarism check and if found guilty, leave a Original Source of Article in the comment tagging @scholaris.pob and other Curators who had Upvoted the Post. Sometimes it's unintentional or by mistake, even if you forget giving proper citations or reference that would considered plagiarism, so if you make a mistake once don't shy and admit what you did wrong, nothing wrong in accepting the mistake and make sure never to commit the same mistake again. But mostly the fraud users once caught they simply run away and later come back with new account, that's really annoying and bad influence on community. It really needs a great community effort to work together to fight plagiarism and fraud in the community.