how to get rid of raccoon?

Last night raccoon came to my backyard again. This time I had chicken coop locked but I was awaken up around 5:30am this morning. I heard very desperately scream from my chickens. I jumped up from my bed and thought the raccoon got into the coop. I ran outside to my back porch and found that raccoon tried to get into the coop. Finally he left. I felt sorry for my neighbors since they must be awaken by the scream of my chicken. Tonight I am going to take the chicken inside of the house. I don't think I can keep the chicken for longer time due to this raccoon issue. I probably will return them to the farm I have bought from. Meanwhile, I like to know if it is legal to trap the raccoon and had it killed.