The Prison Rape Elimination Act of 2003 (PREA; P.L. 108-79)
requires the Bureau of Justice Statistics (BJS) to carry out,
for each calendar year, a comprehensive statistical review and
analysis of the incidence and effects of prison rape. The act
further specifies that the review and analysis shall be based on
a random sample, or other scientifically appropriate sample
of not less than 10 percent of all prisons, and a representative
sample of municipal prisons