The reality of Mass Casualty Violent Acts (MCV A) increasing in frequency according to a recent FBI report. The problem is that Spokane County does not have a current guideline for responding to and forming a Rescue Task Force with Law Enforcement. In Washington State Cheney Fire Department, Spokane Fire Department and the Spokane Valley Fire Departments now have operational teams. The purpose of the research was to develop a countywide operational guideline designed off of current trends and past lessons learned.The action research method was utilized to answer the following research questions; a) What are other local agencies including law enforcement doing to mitigate acts of violence? b) What should be considered for law enforcement and fire personnel responding to a MCVA? c) What considerations must be taken to improve morbidity rates? d) What Washington laws or procedures impact the responses to MCVA?The procedures in this research included a review of literature including related trade journals, and ARP's were reviewed. Active shooter policies from Spokane County departments were gathered for review. Many interviews occurred while training was being conducted, meetings and or interviews with department representatives.The results found that the agencies involved share the vision of keeping the program very similar in order to not confuse law enforcement, and to reduce the risk to all personnel operating in warm zones. Empirical data collected from Spokane County RTF teams is included.It is recommended that the guideline be adopted by the Inland Empire Fire Chiefs Association (IEFCA) to be included in the Field Operations Guide (FOG) in Spokane County and that all public safety personnel be educated on TECC.