I am a ranch manager of a fairly high end show horse ranch and we have an issue with a number of varmints, primarily rabbits and gophers destroying things and such. Shooting a gun (IE a 22 cal) is not all that good of an idea around this place due to the report of the weapon spooking some of the horses. ((This is rather silly when you consider I have horses of my own I can shoot off of, but customers pamper their show horses)). At any rate, I had the idea of possibly having a small laser type of weapon that could reach out to say...100-150 feet to possibly "end" the varmints life with a simple head shot. No sound or anything, just a nice quiet beam of light and no more pest. I am not familiar with this at all, not familiar with the needed power, estimated costs, hurdles I would have to jump to construct such a thing, nor if this is even legal. If it does have legality issues, please tell me as such and I will drop this idea immediatly, and I certainly mean no harm. I ask all of this in complete ernest, and ignorance of this topic. Can anyone please give me some answers to this idea as such please? I am aware i would need a small scope /targeting laser that would be harmless to aim with, and then turn on the "business part" of this idea. Please forgive my ignorance.