We use the usersgent to determine if you are a mobile browser and, if you are, we show you full page AdSense ads and don't load some JavaScript functionality. Can this get us in trouble with google for cloaking? Especially since some intrusive ads are shown with some useragentd but not others?
AdSense had its JavaScript that you can copy/paste for full page ads, but it only displays an ad if you are in a mobile browser. I don't see the point of adding the overhead of downloading and executing the script if we are on a desktop.