.

Estimated additional revenue from raising BOP prisoner telephone call ceiling

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For related discussion, see

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http://purplemotes.net/2011/09/19/setting-limits-on-prisoners-telephone-calling/

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Excel version of spreadsheet (which shows formulas and can be modified) available here:

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http://galbithink.org/prisoners/prisoner-call-limits.xls

.

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source / notes

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prisoners in BOP facilities177,859BOP, weekly population report, BOP facilitieshttp://www.bop.gov/locations/weekly_report.jsp

.

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prisoner call cost:

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local debit call cost per minute$0.06GAO (2010) p. 15

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long-distance call cost per minute$0.23GAO (2010) p. 15

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long-distance call share84%GAO (2010) p. 15

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ave cost per minute$0.20calculated

.

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current limit300GAO (2010) p. 15

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share at current limit25%GAO (2010) p. 18

.

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GAO (2010): Bureau of Prisons: Improved Evaluations and Increased Coordination Could Improve Cell Phone Detectionhttp://www.gao.gov/products/GAO-11-893

.

.

.

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exponential model parameter0.004620981203733model estimate

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new limit500hypothetical

.

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ave. minutessharecalculations

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between current and new limits38515.1%

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at new limit5009.9%

.

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additional revenue$1,176,995

.

.

.

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exponential model test

.

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BOP prisoner calling distribution in 1999OIG, Criminal Calls (1999)http://www.justice.gov/oig/special/9908/callsp4.htm#Field

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less than 300 mins per month72%

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between 300-999 minutes per month24%

.

1000 to 4000 minutes per month4%

.

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exponential model parameter0.004243218919376

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est. between 300-999 mins27%