Westwood,
thank you very much! It is good to know about shelters and fines. Will keep in mind for the next time.
However, after cleaning poo-poo for a year and a half (yeah, every other day...) and 3-4 months of setting the trap each night.. I did not want a smallest chance for that cat to be back to the same owner and poop under my plants again. Besides, cats had no tags on them, so I was not sure whether they did have owners... Finally, I did not bring the animals to the wood or something... there were houses and businesses nearby where they could find a new home. So, I'm sure the cats did not starve to death or were not eaten by wild life.
Good luck with your breeding and citruses! I wish all pet owners were as considerate of others and their own pets as you are.