A zero-tolerance policy in schools is a strict enforcement of regulations and bans against undesirable behaviors or possession of items. Public criticism against such policies have arisen due to their enforcement and the resulting (sometimes devastating) consequences when the behavior or possession was done in ignorance, by accident, or under extenuating circumstances. For example, a ban against guns resulting in a Rhode Island boy with a gun charm on a key chain being suspended. In schools, common zero-tolerance policies concern possession or use of illicit drugs or weapons. Students, and sometimes staff, parents, and other visitors, who possess a banned item for any reason are always (if the policy is followed) to be punished.
In the United States and Canada, zero-tolerance policies have been adopted in various schools and other education venues. Zero-tolerance policies in the United States became widespread in 1994, after federal legislation required states to expel any student who brought a firearm to school for one year, or lose all federal funding.
These policies are promoted as preventing drug abuse and violence in schools. Critics say zero tolerance in schools have resulted in punishments which have been criticised as egregiously unfair against students and teachers, especially in schools with poorly written policies. Consequently, critics describe these policies as zero-logic policies because they treat juveniles the way that adults would be treated — or more harshly, given that children are seldom granted full permission to speak up in their own defence to adults with authority over them. Many people have been critical of zero tolerance policies, claiming that they are overly draconian, provide little if any benefit to anyone, contribute to overcrowding of the criminal justice system, and/or disproportionately target blacks and Latinos.
There is no credible evidence that zero tolerance reduces violence or drug abuse by students. Furthermore, school suspension and expulsion result in a number of negative outcomes for both schools and students.
The American Bar Association has found that the evidence indicates that minority children are the most likely to suffer the negative consequences of zero tolerance policies. Analysis of the suspension rate of students show that black females and other racial minorities are suspended at a greater rate.