Wireless Body Area Network (WBAN) is a wireless network that can be attached or implanted into the human body. This allows medical devices that are used for monitoring any bodily function to be equipped with a wireless network system. This system is vulnerable, similar to any other currently available wireless systems e.g. Wireless Local Area Network (WLAN) and Bluetooth. However, currently there were not many discussions on the WBAN security impact and security threats and if there is any, the issues were discussed through theoretical and simulation data. In this paper, a practical approach to assessing WBAN security impact is designed in order to identify, evaluate, and develop a Secure Network Architecture complete with the Forensic Readiness capability to secure WBAN implementation.