Final answer:
The information does not specify the exact number of drug offenders in the federal prison system population, but it indicates a significant increase in incarceration due to the war on drugs. Racial disparities in the criminal justice system are also highlighted.
Step-by-step explanation:
The total number of drug offenders in the federal prison system population is not explicitly specified in the provided information. However, the information mentions the massive growth of the prison population in the United States due to the war on drugs that started in the 1980s. The graph in Figure 31.10 shows a significant increase in incarceration during that period. Additionally, it highlights the racial inequities in the criminal justice system, with African Americans and Hispanics being disproportionately represented in prisons. Although the exact number of drug offenders in the federal prison system is not provided, it is evident that drug offenses have contributed significantly to the overall prison population in the United States.