According to the Southern Nevada Scanner book from 2009 it is listed as DPS Investigations Div. And there's a footnote that it is used very rarely. Are you hearing alot of traffic on it? Does it sound like Investigating? Maybe somebody new has that id now?
With 05-130 being NHP and 05-132 being NV Transportation Services Authority per the DB, I'd guess one or the other and probably the latter. See if either makes a good listening match.
Steve
The Nevada DPS Investigations Division helps the rural counties with a variety of investigations. Many years ago this Division was known as State Narcotics. This is what you are most likely hearing. Many state law enforcement officers think they cannot be heard by people with scanners since they are on a trunked radio system. Little do they know. And do expect them on a car-to-car channel to be very informal at times for the same reason. A number of years ago they worked out of the DMV building on Idaho St. in Elko.