QUOTE (Neraph @ Mar 17 2010, 12:02 PM)

Unfortunately, RAW does not agree with this statement, insofar as Contact and Injection vectors at least. I can see the argument for ingestion and inhalation, but not Contact or Injection. Same thing with RAW Contact Vector with vehicles.
This is not to say this is how it should be run, but you should at least have a warning that you are talking about house rules, and mention it does in fact work by RAW.
Pg. 254 SR4a
Vector
Vector is the method in which the toxin can be applied.
Contact toxins (in liquid or gas form) must be applied to the target’s
skin. If coated on a weapon, they may be applied with a successful
melee attack (whether or not they cause damage). A chemical seal
(p. 327) offers complete protection unless breached (by an attack causing
damage), while chemical protection (p. 327) gives a bonus equal to
its rating to the Toxin Resistance Test.
Ingestion toxins must be eaten by the victim. They generally take
longer to have an effect. Digestive expansion bioware (p. 345) gives a
bonus of +2 to the Toxin Resistance Test against ingested substances.
Inhalation toxins must be inhaled by the target and are applied as
an aerosol spray or gas. A target wearing a gas mask, chemical seal, or
using an activated cyberware internal air tank (p. 342) is immune to
its effects. Chemical protection gives a bonus equal to its rating to the
Toxin Resistance Test.
Injection toxins must be injected into the target’s bloodstream.
Similar to contact toxins, they may be used to coat a bladed (not
blunt) melee weapon and applied with a successful damage-causing
melee attack.
Pg. 91 Runner's Companion
Free Spirit Nature
A free spirit, in its materialized form, is made of energy in
the form of a set of coherent forces. These forces effect the space
around it, giving it the illusion of shape, mass, and appearance.
The interaction of these forces with the physical world cause light
to reflect at various wavelengths, making it possible for cameras,
ultrasound, radar, and other physical detection methods to perceive
the spirit. A free spirit has the “look and feel” of a physical
being, based on the form it took before it became free, but it is
not made of the materials that appear to make it up; “skin” will
not tan or sunburn, “iron” will not be attracted to magnets. The
spirit has no mass, but the forces in its form have all of the effects
of a body with mass, according to its Physical attributes. A result of
being comprised of energy is that the spirit needs no clothes, food,
or shelter to survive, although, in many cases, the spirit can wear
clothing, eat food (which it can later expel discreetly), and live in
a home, as the social situation warrants. Free spirits may not have
technological augmentations.
This isn't house ruling anything, spirits by RAW don't have skin or a bloodstream, their materialized forms are nothing more than energy manipulating the space around them to seem like matter. Because they don't have skin, a toxin can't be applied to their skin to take effect. Because they don't have a blood stream, a toxin can't be injected into their bloodstream to take effect. Vehicles don't have skin or a bloodstream or lungs or a digestive tract either so they also can't be affected by toxins.