As I wrote in the article, many places still do use paper systems with patient verification: Patients sign an Excel sheet each time a nurse comes to visit. The problem is, sometimes nurses ask patients to sign for multiple visits at one time, so it looks -- on paper at least -- that a nurse has visited every day that week when, in fact, s/he has only been there a few times. And if a nurse is tending to a patient who can nornally live alone but is mentally challenged and needs a nurse for a physical illness, then they may fall prey to fraud.
Also, these EVV systems automate the collection of timesheet data into payroll, so from what I gathered from user organizations, the process of tracking nurses' timesheets is streamlined and much, much faster -- and more accurate -- since the back office no longer has to manually input hours from potentially hundreds of nurses. It's also safer for nurses, who are traveling into residential neighborhoods of all kinds. I know my friends who are home health nurses have had a few horror stories about some of their clients' neighborhoods, especially one friend who prefers night duty. While GPS won't save her life, at least her office knows her location at all times that she's working, should the unimaginable happen.