I have that setting turned ever since I started tracking my website's traffic. But I am sorry to say, it doesn't work reliably. I still see traffic from sites s

I have that setting turned ever since I started tracking my website's traffic. But I am sorry to say, it doesn't work reliably. I still see traffic from sites such as semalt.com and a few others as you can see here. http://i.imgur.com/XGRvLKa.png http://i.imgur.com/XGRvLKa.png