Zero-tolerance school policies will punish any infraction of a rule regardless of whether it was an accident, a violation out of ignorance or extenuating circumstances. Schools normally forbid cell phones, profanity etc, but with a zero tolerance policy, breaking these rules often result in an inordinately harsh punishment such as suspension or expulsion. These policies are promoted to prevent violence and drug abuse in schools but for years critics have pointed out the subjective nature of these decisions on certain students with disciplinary problems. Some difficult students could become targets of the zero tolerance policy, become less educated by multiple suspensions and expulsion which often lead them into the criminal justice system