I think you can check it out from some topic in this forum or some websites on the internet such as scamadviser.com 
Scamadviser isn't that reliable and I find it out that they are only trying to destroy those good casino's that has reputation. And in able to be removed to their red list, you need to pay them. And that is what they are doing, it is still better to visit to the main threads of each casino's here.
sometimes it is not that accurate but mostly the scamadviser service helpful to findout or as a reference whether the site indicated scam or not , just don't make it as your primary and the only one source to decide scam or not , be smart on choosing gambling site.