https://www.bjs.gov/index.cfm?ty=pbdetail&iid=5560

In 2012, juvenile correctional administrators reported 865 allegations of sexual victimization in state juvenile systems and 613 in local or private facilities and Indian country facilities.

The number of allegations per year has fluctuated in state juvenile systems and the rate more than doubled, from 19 per 1,000 youth in 2005 to 47 per 1,000 in 2012.

In locally and privately operated facilities, the number of allegations dropped from 2009 to 2011 and then began to rise in 2012. Based on 2-year rolling averages, the rate in 2012 was 13.5 per 1,000 youth, up from 7.2 per 1,000 in 2010.

From 2007 to 2012, nearly 9,500 allegations of sexual victimization of youth were reported in state or local and private facilities. Fifty-five percent involved youth-on-youth sexual victimization and 45% involved staff-on-youth sexual victimization.

Upon investigation, 25% of the allegations of youth-on-youth sexual victimization and 10% of the allegations of staff-on-youth sexual victimization were substantiated during the 6-year period.

https://www.bjs.gov/index.cfm?ty=tp&tid=20

be based on a random sample, or other scientifically appropriate sample, of not less than 10% of all federal, state, and county prisons, and a representative sample of municipal prisons; and include at least one prison from each state