Google updated its SafeSearch filter for image results, removing the intermediate 'moderate' setting and simplifying the experience for users and administrators.
Google Updates SafeSearch Filter In Image Search
Published on December 13, 2012

Google Updates SafeSearch Filter In Image Search
Google has changed the default behavior of their image search to work similarly to how web search works. Now when you search for less explicit search terms while in image search, Google is more likely to filter out explicit images and set your default SafeSearch filter to the on position.
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