SR4A dart gun, need clarification Options

[Doc Byte]

We need a little help over there at Pegasus' Forum. How does a dart gun work?

Injection Darts: For use with dart guns of various types—such as
the Parashield pistol and rifle—injection darts carry a single dose of a
drug or toxin. Effects depend on the drug payload, but to successfully
deliver the payload and penetrate armor, the attacker needs two net
hits on the Ranged Combat Opposed Test.

First step: Ranged Combat = Firearms + Agility vs. Reaction (+Dodge)
Second step: 2+ net hits?
No = missed
Yes = What now?

Third step: Damage Resistance, I guess. But how? As there's nothing listed against injection vector in the BBB, would it be just Body (+ware)? One the other hand, the dart gun has an AP of -2 so armor has to come into play somewhere along. So would it be toxin's damage level (without net hits as usual) against Body + Impact Armor - 2?

I myself don't own SR4A yet. Maybe the fellow who came up with the question might have overlooked something?