Locust do have a mild poison in them. Even Black Locust thorns will cause you to fester up and turn red more so than other thorns. An old high school buddy used to climb for us. He was still in the Navy reserves at the time. He also ran around with a lot of girls. A few days after taking down a bunch of Black Locusts his wrists broke out in red, festering sores. He never made the conection. I told him the last cheap Ho he was running with gave him syphilis. He got all worried and went to the Navy doctor. Man was he P/Oed at me when he got back. The doctor told him it was just from the thorns, Joe.