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You have enabled Google SafeSearch in your policy but the user is still able to browse without safe search being enforced.
Google has the option to use SSL for searches and if this is enabled it prevents the automatic safe search enforcement from working. Google SSL searches are used by a number of browser plug ins and also if you visit https://www.google.com in your web browser. Google provides a mechanism to disable SSL searches on your network, which is highly recommended for education environments.
To utilise the no SSL option for your network, configure the DNS entry for http://www.google.com to be a CNAME for nosslsearch.google.com.
You should also use the Custom URL module to block encrypted.google.com (encrypted.google.com:443 for CensorNet Professional).
For further information please see this external link on the Google Knowledge Base:
http://support.google.com/websearch/bin/answer.py?hl=en&answer=186669