hereorthere:
Look throughout the the talmud, I am not in front of one so I can’t give you an example off hand.
Also, when you have two Rabbis who come to different rulings on the same topic, who do you listen to (i.e. B’ Shamai and B’ Hillel) or any “Rabbi” in our times. Almost never do you find nowadays a halacha that is endorsed entirely across the board (in other words it isn’t “black and white” but gray).
There is no way that halacha is “black and white”. It is gray. Which is why it can be applied to all sorts of circumstances. If halacha was black and white, then we would never have any disputes (see example above, who have disputed throughout the entire Talmud). If ha;acha was simple “black and white” we would have a simple book (no bigger than 613 chapters) stating “THESE ARE THE RULES”. Even the shulchan aruch has its own disputes within it, with commentaries on it that dispute with each other.