Burglary Security Devices Effectiveness

Transcription

1 Burglary Security Devices Effectiveness Andromachi Tseloni, Rebecca Thompson & Louise Grove (Loughborough University) From 18 October 2013: European Society of Criminology Meetings 4 th -7 th September 2013

2 Research Question What is the preventive effect, if any, of individual and combined burglary security devices against domestic burglary with entry and attempted burglary?

3 'The International Crime Drop Project (partly ESRC funded) Van Dijk, J., Tseloni, A. and Farrell, G. (2012). The International Crime Drop: New Directions in Research. Hampshire: Palgrave Macmillan. Includes Grove et al Farrell, G., Tilley, N., Tseloni, A. and Mailley, J. (2008) The crime drop and the security hypothesis. British Society of Criminology Newsletter, 62: Farrell, G., Tilley, N., Tseloni, A. and Mailley, J. (2010) Explaining and sustaining the crime drop: Clarifying the role of opportunity-related theories. Crime Prevention and Community Safety: An International Journal, 12(1), Farrell, G., Tseloni, A. and Tilley, N. (2011a) The effectiveness of vehicle security devices and their role in the crime drop. Criminology and Criminal Justice, An International Journal, 13, Farrell, G., Tseloni, A., Tilley, N. and Mailley, J. (2011b) The Crime Drop and the Security Hypothesis. Journal of Research in Crime and Delinquency, 48(2), Tilley, N., Tseloni, A. and Farrell, G. (2011) Income disparities of burglary risk. Security availability during the crime drop. British Journal of Criminology, 51(2), Tseloni, Mailley, Farrell and Tilley (2010) The international crime drop: Trends and variations. European Journal of Criminology, 7:

4 Trends in vehicle theft, domestic burglary and personal crime (BCS) (Grove et al. 2012) Prevalence (per cent potential victims) / / / / /10 Year of BCS sweep Vehicle theft Domestic burglary Personal crime

5 Car Theft Security Protection Factors (Farrell et al. 2011a) 30 Protective Factor Attempts Theft from Theft of car A = Alarm C = Central locking E = Electronic immobiliser M = Mechanical immobiliser 5 0 A C M AM E AC CM AE EM AEM ACEMT CE ACM ACE ACEM CEM ACET Security Combination

6 Burglary Security Devices external lights on sensor internal lights on timer window bars security chains burglar alarm double locks or deadlocks windows locks basic security dummy box CCTV

7 Burglary with Entry Security Protection Factors across income groups, 2005/06 BCS (Tilley et al. 2011) Under 4,999 5,000-9,999 10,000-19,999 Protective factor ,000-29,999 30,000-49,999 50,000 or more 0.0 more than basic security basic security Income groups clustered within security categories

8 Burglary Security Devices external lights on sensor internal lights on timer windows locks security chains burglar alarm double locks or deadlocks window bars dummy box CCTV

9 Trends in the availability of burglary security devices Window locks Double locks/deadlocks 70.0 Outdoor lights / / / / / / / / / / /12 Security chains/bolts/bars Burglar alarm Indoor lights Dummy box No security Window bars/grilles

10 Data and Methods British Crime Surveys (BCS)/ Crime in England and Wales Survey (CEWS) All sweeps /12 Here: 2005/ /12 Population of England & Wales Victim Forms: All targeted households BCS/CEWS Crime Prevention Module: Exposed population Security Impact Assessment Tool (SIAT): Odds ratios of targeted households compared to the population. Security Protection Factor (SPF): Comparison of odds ratios of individual or combinations of security devices against no security.

11 Burglary Security Protection Factors for individual devices (sign. 5% level except pink) / /08 BA = burglar alarm DL = double locks SC = security chains EL = external lights on sensor CC = CCTV WB = window bars/grilles DA = dummy alarm Burglary with entry Attempted burglary BA DL SC EL IL WL WB DA

12 Burglary Security Protection Factors for individual devices (sign. 5% level except 2 nd WB) / / BA = burglar alarm DL = double locks SC = security chains EL = external lights on sensor CC = CCTV WB = window bars/grilles DA = dummy alarm Burglary with entry Attempted burglary BA DL SC EL CC WB DA

13 Burglary Security Protection Factors for combined devices (sign. 5% level) 2005/ /08 B = burglar alarm C = CCTV D = double locks or deadlocks E = external lights on sensor I = internal lights on timer S = security chains W = windows that need special keys to open them/window locks Burglary with entry Attempted burglary EIWBD EIWSD EIWD EWSD EWD WSD EIWSBD IWBD IWD EWSBD WD IWSD EW EWBD EBD BD

14 Burglary Security Protection Factors for combined devices (sign. 5% level) 2008/ /12 B = burglar alarm C = CCTV D = double locks or deadlocks E = external lights on sensor I = internal lights on timer S = security chains W = windows that need special keys to open them/window locks 80 Burglary with entry Attempted burglary EIWSBD EIWD EWD EWSBD WSD EWSD EIWBD EIWSD IWSD WSBD IWBD IWD EWBD WD WBD BD

15 Conclusions Increase in the use and number of and improvements in the availability of security devices coincided with the unprecedented burglary falls. Individual and combined security devices prevent burglaries with entry more than attempts. Individual security devices reduce burglaries up to a third. BUT The existence of burglar alarm on its own is counterproductive. Combinations of security devices in general afford up to 50 times more protection than no security. The effects are greater for 2008/ /12 than 2005/ /08 when the burglary drop smoothed.

16 Thank you From 18/10/2013 Project blog: Follow the project on