Modern policing: specialisation, technology and community
Policing in the Twentieth Century
The police forces created in the nineteenth century faced radically new challenges as the twentieth century progressed. Faster criminals, more complex crimes and growing cities all demanded new tools and new ways of working. The response took three main forms: new technologies, specialist units, and — particularly from the 1980s onwards — community-based approaches designed to rebuild trust between police and public.
Transport and Communications
The motor car transformed policing before it transformed crime. From the 1900s, forces began acquiring vehicles to pursue faster criminals and respond to incidents across larger areas. By the interwar period, police forces had radio-equipped cars, and the “999” emergency telephone system was introduced in London in 1937 — a service that seemed revolutionary at the time and created the expectation of rapid police response that the public has held ever since. Control rooms evolved from simple telephone exchanges into sophisticated computer-aided dispatch centres by the 1980s and 1990s.
The 999 emergency system was introduced in London in 1937. It transformed public expectations of policing, creating the assumption of rapid response, and required forces to invest heavily in radio communications, vehicles and control room infrastructure.
Fingerprinting and Scientific Evidence
The late nineteenth and early twentieth centuries saw the application of science to criminal detection for the first time. Fingerprinting was introduced to Scotland Yard in 1901, following the pioneering work of Francis Galton and Edward Henry. The technique allowed detectives to link suspects to crime scenes with objective physical evidence, transforming the investigative process. The first English conviction based primarily on fingerprint evidence came in 1902.
The twentieth century saw further scientific advances. Forensic pathology, blood typing, ballistics analysis and the examination of trace evidence (hair, fibres, soil) all became standard parts of serious crime investigations. The most transformative development came in 1984, when Professor Sir Alec Jeffreys at the University of Leicester discovered DNA profiling. First used in a criminal investigation in 1986 to identify a murderer in Leicestershire, DNA evidence rapidly became the most powerful tool in forensic science. By the 1990s, the National DNA Database had been established, allowing detectives to link crime scene DNA to suspects on an unprecedented scale.
DNA profiling was developed by Professor Sir Alec Jeffreys at the University of Leicester in 1984 and first used in a criminal investigation in 1986. It has since become the most powerful tool in forensic science, enabling convictions (and exonerations) that previous investigative methods could never have achieved.
As crime became more complex, generalised policing became less adequate. Specialist units developed within police forces to tackle particular types of crime. Special Branch was established in 1883 to counter Irish republican terrorism — making it one of the first specialist security units in British policing. The Flying Squad, established in 1919, specialised in serious robberies and was notable for its use of vehicles and rapid response. The Serious Fraud Office was created in 1987 to tackle complex financial crime beyond the capacity of ordinary detective units. Counter-terrorism policing has expanded dramatically since 2001.
Community policing emerged as a formal strategy from the 1980s, partly in response to serious breakdowns in police-public relations — the Scarman Report (1981) following the Brixton riots highlighted how aggressive policing tactics had damaged trust in inner-city communities. The concept was that policing was most effective when officers knew their areas well, worked alongside local people, and addressed the underlying conditions that bred crime (unemployment, poor housing, drug dependency) rather than simply responding to incidents.
The Police Reform Act of 2002 created Police Community Support Officers (PCSOs) — uniformed civilians who could patrol communities, engage with residents and deal with minor anti-social behaviour without the full powers of a sworn officer. PCSOs were controversial: critics argued they were a cheap substitute for real officers; supporters pointed to their success in community engagement. By the 2010s, however, austerity cuts had reduced PCSO numbers significantly.
Neighbourhood Watch and Public Involvement
Technology alone could not solve the problem of community trust. From the early 1980s, Neighbourhood Watch schemes spread rapidly across Britain, following an American model first introduced in the 1970s. By the early 1990s, over five million households had joined a scheme, making it one of the largest voluntary crime prevention movements in British history. The scheme reflected a recognition that the police could not be everywhere: effective crime prevention depended on the eyes and knowledge of the communities themselves.
Neighbourhood Watch worked best in stable, owner-occupied suburban areas where residents knew each other. In high-turnover urban areas with transient populations, schemes were harder to establish and sustain. Critics noted that Neighbourhood Watch could entrench social exclusion — leading to suspicion of unfamiliar faces rather than genuine community safety. The scheme nonetheless demonstrated a broader shift in policing thinking: reducing crime was a shared responsibility between police and public, not simply a matter of more officers or better technology.
Policing the Digital Age
From the 1980s and accelerating through the 1990s and 2000s, CCTV became a defining feature of British public space. By the 2000s, Britain had more CCTV cameras per person than almost any other country in the world, with cameras covering high streets, transport hubs, stadiums and car parks. Footage from CCTV systems became a routine part of criminal investigations — the 2005 London bombings investigation relied heavily on camera footage to identify the attackers within days. Proponents argued CCTV both deterred crime and aided detection; civil liberties groups raised concerns about mass surveillance of innocent people in public spaces.
Computer databases transformed police record-keeping and intelligence sharing from the 1980s onwards. The Police National Computer (PNC), introduced in 1974, allowed forces across Britain to check vehicle and criminal records in seconds rather than hours. The combination of PNC access, DNA databases, CCTV footage and digital communications meant that by the early twenty-first century, modern policing operated within an intelligence infrastructure entirely unrecognisable to a 1950s beat officer.