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1 Patrick A. Langan & Lawrence A. Greenfeld, The Prevalence of Imprisonment 1 (1985)

handle is hein.death/previmp0001 and id is 1 raw text is: U.S. Department of Justice
Bureau of Justices Special Report

Bureau of Justice Statistics
Special Report

The Prevalence
of Imprisonment

By Patrick A. Langan, Ph.D.
with the assistance of
Lawrence A. Greenfeld
BJS Statisticians
In the 1960s, while crime soared,
prison populations declined. What fol-
lowed in the 1970s was a marked shift
in national opinion: increasingly, the
public began to demand that the juitice
system get tougher with criminals.
The response of the justice system
seemed immediate. From 1970 to 1979,
the imprisonment rate surged a record
39%, the largest single decade increase
since the 1920s, when the Federal
government started keeping records on
State and Federal prison populations.
The 32% increase during the 1930s is
the closest any other decade has come
to this record.
Since the 1970s, imprisonment rates
have continued to climb. With a 36%
increase in just the first five years of
the 1980s, and with further increases
projected for the remainder of the de-
cade, indications are that the impris-
onment rate increase of the 1980s may
turn out to be the biggest ever.
The significance of these statistics
on the changing imprisonment rate is
that they are a measure--perhaps the
measure-by which the public gauges
government response to crime. But
these statistics do not speak for them-
selves. The changing imprisonment
rate is actually a measure of the num-
ber of persons (usually per 100,000 pop-
ulation) in prison on a single day in one
year relative to the number in prison on
a single day in another year. The vari-
ous implications of a change in these
single-day counts are not obvious.

July 1985

With this study, the Bureau of
Justice Statistics introduces a new
statistical indicator measuring the
use of imprisonment as a sanction
for crime. The prevalence of
imprisonment indicator, along with
the annual count of prison inmates,
gives a comprehensive portrait of
the American prison system in
both static and dynamic terms.
While the annual count of inmates
reveals the number of prison in-
mates on 1 day, the prevalence
indicator measures the cumulative
effect on the Nation's population
of admitting and releasing inmates
from State prisons.
The findings of this study ques-
tion some widely held beliefs about
prisons, about deterrence (the
inhibiting effect of the threat of
imprisonment on the criminal ac-
tivity of people), and about inca-
pacitation (the effect that prisons
have on reducing crime by pre-
venting offenders from committing
crimes in society). The fact that
so few criminals go to prison
relative to the large volume of
serious crime convinces many that
prisons cannot possibly have much
of a deterrent or incapacitative
effect on crime. Assessing the
States' use of imprisonment in

This study translates imprisonment
rates into more easily understood
terms, better to convey the implica-

dynamic terms, however, reveals
that the proportion of the Nation's
population affected by imprison-
ment is higher than might
previously have been realized.
Moreover, it suggests that the
deterrent and incapacitative
potential of prison may be larger
than previously thought.
Estimates of the prevalence of
incarceration are useful for a
number of other reasons as well.
Presenting incarceration rate data
in this form facilitates comparison
of the likelihood of imprisonment
with other prevalence indicators of
significant life events increasingly
being used to convey important
epidemiological information to the
public. These data are valuable
for planning purposes in anticipat-
ing future prison populations. The
prevalence indicator is also useful
for measuring recidivism, or the
percentage released from prison
who eventually return to serve
another sentence. These detailed
measures of lifetime recidivism
establish a national benchmark
(the first of its kind) against which
future claims of superior correc-
tional efficacy can be evaluated.
Steven R. Schlesinger
Director

tions of record prison population growth
in the 1970s. The findings presented
disclose that the proportion of the pop-

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