Zero Tolerance by Claudia Mills tells the story of fictional character Sierra Shepard, a seventh-grader who accidentally brings a plastic knife to school. This occurs when she takes the wrong lunch bag to school (her mom’s instead of her own). Her school clings to a zero tolerance policy and she is still expelled even though she turns in the knife as soon as she finds it. Her father protests the policy by researching the background of her defendant and presenting what he has found at Sierra’s hearing. Sierra eventually wins the case, allowing her to stay at the school.