can not clear the "Still Infected" Symantec Endpoint Protection Manager 12.1

I have a function in the Clear still inface in the next version of symantec end point protections manager. Because there v12.1 Drive DVD and Device Extarnal log is a log of the unit depending persist and can not be cleared. Which I am seeking information from the website and found v 12.1 symantec can not do. I think in the development of the next issue will be resolved. 

thank