> But how would you guarantee it was the right amount to knock out the victim?
The device spews out a constant quantity of chemicals per minute when turned on. The concentration in the air will be rising from this point on until is reaches the MAC index. The speed at which it will rise depends on the volume of the room and how fast the AirWick can spew out its chemicals. Conversely, the concentration will drop when you open the door or turn off the device. A victim, any victim, would have to spend some significant time for the concentration to slowly rise above the MAC index. I don't know how much vaporization a pluggable AirWick can spew out, but this can be measured or experimented beforehand.
> Also how can you guarantee it getting the right person?
You have to force an event that will make this person spend enough time in that closed space. It's a matter of being smart with the method. A hacked laser printer ink cartridge that drops its contents on the victim's clothes, Ipecac in the coffee, etc.
> Finally how can you know the time at which your victim will enter the room without coincidence?
Only those who spend enough time in the close space will feel the effect. Again, if you can provoke such an event with a specific victim in mind, timing is a moot point.
> The victim would have a killer headache and be pretty nauseous once
> there was enough of it in his system to affect him.
That is the main drawback. I don't know how to fix that. Maybe other derivatives don't have such side effects.
As stated above, there are better methods than choloroform.
-cb