http://bf4cheatreport.com/?pid=&uid=CASTvivian&cnt=20&start=&startdate=&checkboxtext=true&rid=

http://battlelog.battlefield.com/bf4/battlereport/show/1/1023389252727934784/899588695/

This person hasn't played in a year and returns with these stats. Check out the fourth column. 64% HS/K 

http://battlelog.battlefield.com/bf4/battlereport/show/1/1023389252727934784/899588695

http://battlelog.battlefield.com/bf4/battlereport/show/1/1023400582834884416/899588695

http://battlelog.battlefield.com/bf4/battlereport/show/1/1023407333445668224/899588695