lyle2231; an M-44 is a spring-loaded device, with a plunger that when compressed has a trigger that holds the plunger in place until it is pulled upward, you have a tube stake that is driven in the ground that this is placed in and a ring that is turned over a slot to keep in in the tube. then a top that hold a plastic cartridge of sodium cyanide, measured to not kill an animal larger than 110 lbs., is screwed on the plunger unit. the top is wrapped with an absorbent material so that it will hold a paste bait on it to attract predators. That is just a simple explanation. There are at least 25 federal restrictions, it used to be 26 but they dropped the one about the antidote kit, on their placement and usage the person placing them also has to be certified in their usage and an inspector will check you and your placed units, without prior notification to you. The color of the dye is red for federal employs and fluorescent green or yellowish for non-government persons, it has the dye in it due to the Tylenol poisonings. I will see if I can post a picture of one.