Over a year ago, while in the Houston, Texas area, I stumbled across some encrypted P-25 traffic on 414.5625 MHz, NAC 168. The traffic was simplex and have found no confirmed data on what agency might be using that frequency.
Recently another listener in the Houston area has reported hearing activity on that same frequency, also encrypted, so whoever it is, they are still in business.
However, now I have received a report from the Charlotte, North Carolina area of the same frequency and and NAC being used there. Again, always encrypted, so no agency identification has been determined yet.
Keep this one in your scan list and see if it is active near you!