GetUnitRace() for NPCs

[Uesp]

I tried using the following to log information on NPCs inside a EVENT_RETICLE_TARGET_CHANGED function:

local level = GetUnitLevel(unitTag)
local gender = GetUnitGender(unitTag)
local difficulty = GetUnitDifficulty(unitTag)
local class = GetUnitClass(unitTag)           --Doesn't work
local race = GetUnitRace(unitTag)            --Doesn't work

The first 3 functions work fine but the Class/Race functions return an empty string. I assume they work fine on PCs but was wondering why not working on NPCs? I would expect NPCs to have a set race. As far as I can tell there are no other "get race" type functions in the API.

Any ideas or pointing out something I've missed would be great.