As the reader moves through the various stories about Mowgli, we see that there are a lot of laws in the Law of the Jungle. More than likely, readers don't ever get to know all of the laws, since we are told that Baloo only teaches the wolf cubs what they need to know about the law as it pertains to the pack. Baloo defends that Mowgli needs to know more of the laws, but we don't get a law-by-law narrative. What readers get is a law explained here and there throughout the text as it pertains to that particular moment.
In the first story of The Jungle Book, readers are given the first example of a law from the Law of the Jungle, and we immediately see that Shere Khan has broken this particular law. The law is that no animal may change their hunting ground without warning that they are going to change to a new hunting ground. Tabaqui states that Shere Khan has "shifted his hunting grounds" and will hunt in the areas that are close to the wolves for the "next moon." Father Wolf angrily replies that Shere Khan has no right to do that and clarifies by saying that the Law of the Jungle requires due warning about changing "quarters." Father Wolf explains that Shere Khan's presence will scare away existing prey:
“He has no right!” Father Wolf began angrily—“By the Law of the Jungle he has no right to change his quarters without due warning. He will frighten every head of game within ten miles, and I—I have to kill for two, these days.”
Shere Khan will also attempt to break the law that forbids the killing of a human—in trying to kill Mowgli—but Shere Khan fails to kill the boy; therefore, Shere Khan changing hunting grounds without warning is a much better example of a character breaking the Law of the Jungle.