The best way to identify if a site is using a particular CMS/whatever is to look at the style sheets. <style type="text/css" media="all">@import "/modules/logintoboggan/logintoboggan.css";</style> Code (markup): LoginToboggan is a Drupal module.
Smart guy, that is also a general way to identify which cms is used in a site . Review its source code, css code and judge it by their path information .