Article continues below advertisementThe man leading the investigation into Nancy Guthrie's alleged abduction says authorities are not giving up on their search for the 84-year-old anytime soon.During an interview with reporter Brian Entin on Tuesday, February 17, Pima County Sheriff Chris Nanos was asked, "How long can this go on for, in terms of the investigation at this level?"Nanos replied, "Because of the media, we've generated so many leads. Last Wednesday, we had 18,000 leads. The FBI had 14. So you're talking over 30,000 [leads]. We're probably closer to 40 or 50,000.