youth detained increased by 9% and the number of Hispanic youths detained increased by 4%, yet the proportion of White youth declined by 13%. Documentation of this phenomenon can be seen as early as 1975 with the book School Suspensions: Are they helping children? Additionally, as punitive action leads to dropout rates, so does imprisonment. Data shows in the year 2000, one in three black male students ages 20–40 who did not complete high school were incarcerated. Moreover, about 70% of those in state prison have not finished high school. Lastly, if one is a black male living post-Civil Rights Movement with no high school diploma, there is a 60% chance that they will be incarcerated in their lifetime. Immigrants and foreign nationals The United States government holds tens of thousands of immigrants in detention under the control of Customs and Border Protection (CBP) and Immigration and Customs Enforcement (ICE). These immigrants seek asylum into the United states and are detained prior to release into the United States or deportation and removal from the country. During 2018, 396,448 people were booked into ICE custody: 242,778 of whom were detained by CBP and 153,670 by ICE's own enforcement operations. The BOP receives all prisoner transfer treaty inmates sent from foreign countries, even if their crimes would have been, if committed in the United States, tried in state, DC, or territorial courts. Non-US citizens incarcerated in federal and state prisons are eligible to be transferred to their home countries if they qualify. Operational Security levels In some, but not all, states' department of corrections, inmates reside in different facilities that vary by security level, especially in security measures, administration of inmates, type of housing, and weapons and tactics used by corrections officers. The federal government's Bureau of Prisons uses a numbered scale from one to five to represent the security level. Level five is the most secure, while level one is the least. State prison systems operate similar systems. California, for example, classifies its facilities from Reception Center through Levels I to V (minimum to maximum security) to specialized high security units (all considered Level V) including Security Housing Unit (SHU)—California's version of supermax—and related units. As a general rule, county jails, detention centers, and reception centers, where new commitments are first held while either awaiting trial or before being transferred to "mainline" institutions to serve out their sentences, operate at a