Effects of incapacitant spray deployed in the restraint and arrest of detainees in the Metropolitan Police Service area,London, UK: a prospective study |
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Authors: | J Jason Payne-James Graham Smith Elizabeth Rivers Sarah O’Rourke Margaret Stark Nick Sutcliffe |
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Institution: | 1. Cameron Forensic Medical Sciences, Barts and The London School of Medicine and Dentistry, Charterhouse Square, London, EC1, UK 2. Mechanical Engineering, Materials Science and Civil Engineering, Centre for Applied Science and Technology, St Albans, UK 3. Great Ormond Street Hospital, London, WC1, UK 4. Faculty of Medicine, University of Sydney, Sydney, Australia 5. Metropolitan Police Service, London, UK
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Abstract: | Purpose In the United Kingdom (UK) police restraint and control of detainees is undertaken by assorted means. Two types of incapacitant spray (IS) are approved by the UK Home Office for use: CS (o-chlorobenzylidine malononitrile, dissolved in an organic solvent—methyl iso-butyl ketone and pelargonic acid vanillyamide (PAVA). The aim of this study was to document the effects of incapacitant sprays, by symptom assessment and medical examination, within a few hours of deployment. Methods A detailed proforma was produced to explore the nature of the arrest, the nature of exposure to the incapacitant spray, the type of incapacitant spray, the symptoms experienced and the medical findings. Results 99 proformas were completed. 74 % were completed by detainees and 26 % were completed by police officers. 88 % were exposed to CS spray, the remainder to PAVA spray. The mean time of assessment after exposure was 2.8 ± 2.33 h (mean ± SD). The most frequent sites of IS contact were the face and scalp (n = 78), and exposure to the left and right eyes (n = 32). The most common symptoms were: painful eyes (n = 68); red eyes (n = 58); runny nose (n = 59); lacrimation (n = 55); nasal discomfort (n = 52); skin irritation (n = 49); and skin burning (n = 45). The most common medical findings were: conjunctival erythema (n = 34); skin erythema (n = 21); and rhinorrhea (n = 20). Conclusions Symptoms and signs of exposure to IS lasted longer than was expected (a mean of 2.8 h). Approximately 30 % of those exposed had ocular effects and 20 % had skin effects. The findings of this study will enable the guidelines on the expected effects and duration of symptoms resulting from exposure to incapacitant sprays to be reviewed and suggestions for their management to be refined. |
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