National drug policy has the greatest impact on the criminal justice system. Since many Americans use or sell illegal drugs, the drug policy statement provided an opportunity to strengthen laws and be able to punish drug users with harsh laws. However, after his declaration in the early 1980s, this resulted in prisoner overcrowding in the United States. Furthermore, as he has carried out enormous prison growth, he has increased state budgets for the penal system and cut state funding for education and other services. Like other policies, the “war on drugs” has both advantages and disadvantages. Samuel Walker's Sense and Non-sense About Crime, Drugs, and Communities, Steven E. Barkan and George J. Bryjak's Myths and Realities of Crime in America, and Michelle Alexander's The New Jim Crow: Mass Incarceration in the Age of Colorblindness describe in-depth "war on drugs" and its positive and negative consequences. After the Harrison Act of 1914, American drug policy came under scrutiny from the hawkish approach, which is becoming increasingly tough on drug law enforcement. Literally, the phrase “war on drugs” means “war” declared on drugs by increasing arrests and incarcerations of both users and dealers. As a result, law enforcement has disrupted illegal drug markets. Not only has the “war on drugs” had great effects on Americans and the criminal justice system, but also on minority racial groups, especially African Americans, who are the main victims of the war on drugs. African Americans are treated more harshly at every stage of life. criminal justice system, and the resulting cumulative disadvantage generates the enormous disparity between the percentage of African Americans in prison and their representation in the general population. (Walker 311) However, there is also an argument that targets the fact that people who are placed in the socially lower classes are more likely to use illegal drugs or