Right, Treewyrm already posted about this, backed up by Jinx and Gronath. For those of you that don't know, Treewyrm leads the Keepers, the only Nomad faction, and is very closely connected with Das Wilde, the only infested faction. He's also working extensively with existing Nomad lore and building greatly upon it. I think he knows what he's talking about.
There is no need for an infested human ID, first off, if they are infested and are hiding amongst humans then they can do that successfully for years on end until the time is right. If they are openly infested, they are a part of Das Wilde, and thus use the Wild ID.
Nomad Laser = Invisible organic thing. Infests your ship, only available on Xerna, the Ravine, and the Wilderness. No worries there, its Keepers/Das Wilde only.
Nomad Blaster = Human made thingie. Results from extensive negative interaction with Nomads/Wilde, and the Keepers and Das Wilde will kill you if they see them. House militaries should be suspicious of these (KoS in Rheinland I believe) although higher ups in the LSF may use a few of them because of Alaska. The Order also may use them to better understand their foe.
They aren't ooRP. If you see them in large numbers, be suspicious and call in the local police. If they're an Outcast, tell Eppy and they truly will be outcast. (Whole different matter there, Outcasts shouldn't be farming Nomads...)