Miller and EquuSearch volunteers are in Wichita searching for 5-year-old Lucas Hernandez.
He vanished almost two weeks ago.
Police gave approval to EquuSearch to conduct a search this weekend.
Miller says EquuSearch has assisted in over 1700 missing person's cases, including high-profile cases like Natalee Holloway.
RELATED: Lucas Hernandez missing: FBI joins search for 5-year-old boy in Kansas