Let's just not create unnecessary fear which doesn't even need its implementation, where an OP just asked a simple question "why my application taking this long". First off, all IOs are trained pretty much to deal with any case type, sometime they do need a supervisor input if they find themselves stuck in deciding what to do. Marriage based, this based or that based, IOs know what they are doing and how to tackle cases with brain. Else about marriage fraud or sham marriages, application getting delayed isn't necessarily because of USCIS is considering a particular application a fraud. It could be million other reasons. People here doesn't need to be scared from the answers on the question they ask. Let's be easy in our responses.