M44's are currently approved and registered for use on coyotes.

Problem is, due to the cyanide, they will never be approved for use on Federal land.

Google "Coyote Lure Operative Device" {CLOD} and you will find the next generation of delivery devices, this one being geared up for theobromine/caffeine.

Problem at present is the testing lab indicates a lethal does is easy to get IN the coyote, but they commonly puke it out. We need a palatable, humane {yeah, that's important...}, lethal AND palatable chemical/toxicant. Xylitol just may meet those criteria AND if a recipe and or delivery device can be produced, take care of canids like nothing else; it is environmentally inert and safe to humans. 4 grams are said in the veterinary literature to be deadly to a 90 lb dog.