because my parents are having suspicions about their 16 year old sone they are planning on hiring a techie to get into my mac, and look at all previous search histories. How can i delete the search history any evidence of any sight i have ever been on? i know how to clear my history and i know how to clear out searches from google, but besides that im terrified an experienced person will be able to get into the back of my computers head and pull out unwanted information. thanks for the help