We typically have volunteers completing Court-Ordered Community Service hours at our location and we normally have a large number of volunteer at one time so it is not always possible to keep track of  which volunteers are present when signing in. Though I know the hours volunteers add for themselves are pending but my suggestion would be to have an on/off button so that specific volunteers are not able to add their own hours and can only sign in and out the day of their shift. Especially because volunteers can sign in at our Kiosk days before the actual volunteer event.