Custom Safe Search WebFilter Blocking Script

[CFITECH]

I am seeking a custom script for the web filter to enforce search engines to use safe search only. We are currently experiencing an issue when students go into google or yahoo search preferences and turn off the restrictions, and then do image searches, very innappropriate images come up. I know the filter I use at home (www.k9webprotection.com) has this ability and I really need to enforce this at 7 schools where i have installed X5 devices.