Sounds good in theory but in practice this would turn out to be terrible. How do you even define a poacher ? Maybe they start using intermediaries. They use a

Sounds good in theory but in practice this would turn out to be terrible. How do you even define a poacher ? Maybe they start using intermediaries. They use anonymous locations as a way to sell the horns ? Maybe once their buyer appears on site to take the horn, they take a picture and shot the buyer calling him the "poacher" to collect the poacher money and resale the horn ? Allowing legal murder of humans should only be instituted by the state and not be individuals, even the state screws up the process and individuals are much less trustworthy. The poaching problem requires both attack from supply side and demand side using various soft techniques. The only reason the horns are important is due to its social value. We do not have poaching problems with ants,spiders,monkeys,etc. because killing and the keeping their body parts has little social value to humans and there exists a strong penalty if you have a dead monkey in your house ! This is frankly china's problem.