Mobile government provides unique opportunities to utilize mobile technology to receive government services and information literally from any place, at any time, using varieties of wireless networks. However, mobile devices are using wireless network broadcasts which are vulnerable as they send signals over the public airwaves. With the rapid growth of mobile devices and Internet services, there is a growing need for user and government authentication for the protection of data and services, and to promote public trust. This paper presents the process of the grounded theory application to information system security research to develop a substantive theory for the successful implementation of biometric authentication in m-government security. It concludes by presenting the findings in the form of categories with their relationships. These emerging categories indicate the factors that influence the adoption of biometrics in m-government security.