How long to leave the code that Norton used to say my site is safe in the header on my blog? Should it be removed and why?

I have put the 28 code thread in the body at the home page of my blog.  Norton has now verified it as "SAFE" but it doesn't show up when googled.  Is there a longer process before it gets the Safe logo on google searches and so should I continue to leave that 28 thread on my site.  Why should it be removed anyway, its is a security risk to leave the code there?