Can I ware a body cam and a microphone at the place I work at for my own protection from being fired

In Tennessee it is lawful to record a conversation only if you are a party to the conversation.  There is a danger that wearing a microphone continually will record conversations that you are not a party to.  However, employers in Tennessee can legally prohibit employees from recording conversations in the workplace including ones that they are a party to.  So, even if you are only recording coversations you are a party to at your workplace, your employer can still terminate your employment for doing so.