You say you have it down to a science, but you didn't mention the preferred way of doing it! CO2 asphyxiation is the method that is used by nearly all breeders who put their own rodents down. If you search some you'll find links on how to build a "gas chamber". There are several different methods to use - CO2 tank (paintball tanks work), dry ice, or vinegar and baking soda are all ways to introduce the CO2. I use the vinegar and baking soda method, but will switch to a tank as soon as I can afford the one I want!
Steve
edit - Ok, I just woke up. I see it does say suffocation, so you're good!end edit
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