I was requested by many of my clients to check for Google banned/penalty before providing them expired domains or Web 2.0s. I was using a Google banned checker I found online here: http://www.webmastercare.com/google-banned-checker/ To check if the expired domains or Web 2.0s were penalized. And in almost 80% of the cases, it showed penalized due to which it was creating a lot of problems. So, today while testing it out I thought of trying out websites I know are definitely not penalized to check the effectiveness of the checker. I entered many of my own websites and it was showing many of them as banned whereas those were very big websites with a lot of pages indexed in Google. It was just not possible. So, I was very confused. I then entered BHW domain name and it also showed as banned. Then I entered DP forums url and it also showed that as banned. And finally I entered moz.com and even that showed up as banned. That was just the icing on the cake and I could well understand that the checker was just a lot of horse sh!t and I had wasted a lot of good expired domains and Web 2.0s in the last two weeks for this terrible checker. Each of the above three websites had upto a million pages indexed in Google and it was just not possible for any of them to be Google banned. How do these worthless Google banned checkers work? How do they randomly come up with the idea of whether a website is banned or not in Google? Does anybody have an idea?