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Criminal Designs Sheila M. Bird MRC Biostatistics Unit, CAMBRIDGE CB2 2SR.

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Presentation on theme: "Criminal Designs Sheila M. Bird MRC Biostatistics Unit, CAMBRIDGE CB2 2SR."— Presentation transcript:

1 Criminal Designs Sheila M. Bird (sheila.bird@mrc-bsu.cam.ac.uk) MRC Biostatistics Unit, CAMBRIDGE CB2 2SR

2 “What works” in UK criminal justice? Large RCTs essentially untried...

3 Judges prescribe sentence on lesser evidence than doctors prescribe medicines Is public aware?

4 Drug Treatment &Testing Orders (DTTOs): evaluations charade (1) England and Wales: 210 clients Scotland: 96 clients Targets for DTTO clients in E&W: 6000+ per annum DTTO clients > > 21,000 by end 2003

5 RSS Court DTTO-eligible offenders: do DTTOs work ? Off 1 DTTO Off 2 DTTO Off 3 alternative = Off 4 DTTO Off 5 alternative = Off 6 alternative = Database linkage to find out about major harms: offenders’ deaths, re-incarcerations &... Serious further offences

6 Judicial trial’s 3-way randomisation: D = 400 to DTTO, A = 400 to alternative, J = 800 to judge decides between DTTO versus alternative Is J. better than A+D?

7 Performance Monitoring in the Public Services

8 Electronic tag as worn by offenders

9 Electronic surveillance: tagging  ? diversion from prison, RLO (Restriction of Liberty Order)  early release from prison, HDC (Home Detention Curfew)  diversion from remanded to jail, EM-bail (Electronically-Monitored bail versus remand may influence trial date and/or judge’s sentence... )  ? addition to community sentence, ISSP (Intensive Supervision and Surveillance Program)

10 Linked fatalities per 10,000 offender-years Offender category Estimated number Estimated offender-years Linked fatalities Fatality rate per 10,000 offender-years HDC: early release,England 135,000 (1999-2005) 18K ~ 33K61.8 ~ 3.4 Foreign non-deported: ~ 2,500 (1999-2006) 7.75K2At least 2.6 RLOs: Scotland 2,957 (2002-2005) 1.25K or (500 jail-diverted) 1 8 or (~ 20) Curfew Os: England ~54,186 (1999-2005) ~12.8K?? HMI Probation ? (per annum: England, 2005) 200K~ 40 ~ 2

11 Cost per linked fatality? £1.5 millions pounds mostly, life-years lost and impact on families  costed, but not re-imbursed, by Criminal Justice!

12 Restriction of Liberty Orders Scotland’s CJ study... Public consultation... Private tender for electronic tagging... Post-marketing surveillance... (diverted from jail?)

13 Application of scientific method R andomisation: to compare like with like A dequate study size: for precise estimation R eporting standards: as in medical journals E fficacy and costs: rational, prior estimates P eer scientific review of S tudy/trial protocol

14 Scottish courts’ RLO-eligible offenders: ? guess Off 7 RLO [ ? ] Off 8 RLO [ ? ] Off 9 RLO [ ? ] Off10 RLO [ ? ] Off11 RLO [ ? ] Off12 RLO [ ? ] Off13 RLO [ ? ] Off14 RLO [ ? ] Breach rates & costs versus... [ ? ]

15 Evaluations-charade (2) funded guesswork: electronically monitored RLOs Scotland: 143 clients (152 RLOs; 422 assessed) 75% RLOs for 3-6m Failure in 40/143 RLOs; prison for 23/40 + 11/103. Assessed, not given RLO: 40% sent to prison !! Assume equal #s of 3m & 6m RLOs {£3,680}, annual cost in Scotland of £3.68m  1000 RLOs! Saving of  £300,000 if RLOs displace equal length prison terms, or... £1.7m if all displaced prison terms were 6m...

16 Public Consultation v. private contract public opinion re electronically monitoring for... “Cost of national RLO roll out could be in the region of £4 millions annually, compared to a long term prison saving of £1.7 millions!” “1000 RLOs - used as in pilot - could mean reduction of 400 in # custodial terms, but add back 100 for breach actions...”

17 Linked fatality: Scotland Callum Evans (born 1987, Restriction of Liberty Order, June 2005): with Peter Clark (also 18) in October 2005, murdered 23-year old John Hatfield (132 injuries ~ knife/machete & axe) outside CE’s home. CE’s being outside his residence did not trigger alarm because tag had been wrongly set by Reliance

18 Was CE’s RLO a diversion from jail ? or Tagging added to community order ? Not known !

19 DESIGN: Electronically-Monitored bail v. remanded to prison When to randomise? What to compare? Costs?

20 Post-RCT Outcomes Re index offence: Time to trial/sentence Actual sentence Within y years: Days in custody Days on community order Serious further offence Survival @ 3 years Costs

21 Randomised controlled trials to police Policy by Home Office Prisons & Criminal Justice

22 Evaluations-charade Failure to randomise Failure to find out about major harms Failure even to elicit alternative sentence  funded guesswork on relative cost-effectiveness Volunteer-bias in follow-up interviews Inadequate study size re major outcomes...

23 Five PQs for every CJ initiative PQ1: Minister, why no randomised controls? PQ2: Minister, why have judges not even been asked to document offender’s alternative sentence that this CJ initiative supplants {re CE}? PQ3: What statistical power does Ministerial pilot have re well-reasoned targets? {or just kite flying...} PQ4: Minister, cost-effectiveness is driven by longer-term health & CJ harms, how are these ascertained {  database linkage}? PQ5: Minister, any ethical/consent issues?


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