history sniffing
... that history sniffing has been used to track Papa John's customers?
... that <b id="mwBG0"><a href="./History_sniffing" id="mwBG4" rel="mw:WikiLink" title="History sniffing">history sniffing</a></b> has been used to track <a href="./Papa_John's" id="mwBG8" rel="mw:WikiLink" title="Papa John's">Papa John's</a> customers?