Theresa May served as home secretary from 2010 until 2016. As a member of David Cameron's first government May was appointed as home secretary on 12 May 2010, shortly after Cameron became prime minister, and continued in the post as part of the second Cameron government following the 2015 general election. She held the post until she succeeded Cameron as prime minister on 13 July 2016. May was the second woman to be appointed as home secretary (after Jacqui Smith), and the fourth woman to hold one of the Great Offices of State.

The longest-serving home secretary since James Chuter Ede over 60 years previously, May pursued reform of the Police Federation, implemented a harder line on drugs policy including banning khat and brought in further restrictions on immigration. She oversaw the introduction of elected police and crime commissioners, police investigations including Operation Yewtree, the deportation of Abu Qatada and the creation of the College of Policing and the National Crime Agency.

Appointment

On 12 May 2010, when Theresa May was appointed home secretary and minister for women and equality by Prime Minister David Cameron as part of his first Cabinet, she became the fourth woman to hold one of the British Great Offices of State, after (in order of seniority) Margaret Thatcher (prime minister), Margaret Beckett (foreign secretary) and Jacqui Smith (home secretary). As home secretary, May was also a member of the National Security Council. She is the longest-serving home secretary for over 60 years, since James Chuter Ede who served over six years and two months from 1945 until 1951. May's appointment as home secretary was unexpected, as Chris Grayling had served as shadow home secretary in opposition.

May's debut as home secretary involved overturning several of the previous Labour Government's measures on data collection and surveillance in England and Wales. By way of a Government Bill which became the Identity Documents Act 2010, she brought about the abolition of the Labour Government's National Identity Card and database scheme and reformed the regulations on the retention of DNA samples for suspects and controls on the use of CCTV cameras. On 20 May 2010, May announced the adjournment of the deportation to the United States of alleged computer hacker Gary McKinnon. She also suspended the registration scheme for carers of children and vulnerable people.

On 4 August 2010 it was reported that May was scrapping the former Labour Government's proposed "go orders" scheme to protect women from domestic violence by banning abusers from the victim's home. This was followed on 6 August 2010 by the closure of the previous government's "ContactPoint" database of 11 million under-18-year-olds designed to protect children in the wake of the Victoria Climbié child abuse scandal.

On 2 June 2010, May faced her first major national security incident as home secretary with the Cumbria shootings. She delivered her first major speech in the House of Commons as home secretary in a statement on this incident, later visiting the victims with the Prime Minister. Also in June 2010, May banned the Indian Muslim preacher Zakir Naik from entering the United Kingdom. In late June 2010, May announced plans for a temporary cap on UK visas for non-EU migrants. The move raised concerns about the impact on the UK economy.

Speaking at the Association of Chief Police Officers (ACPO) conference on 29 June 2010, May announced radical cuts to the Home Office budget, likely to lead to a reduction in police numbers. In July 2010, it was reported that May had corresponded with Kate and Gerry McCann, the parents of the missing child Madeleine McCann. In August 2010, May attended a private meeting with Mr and Mrs McCann to discuss their case.

In July 2010, May presented the House of Commons with proposals for a fundamental review of the previous Labour government's security and counter-terrorism legislation, including "stop and search" powers, and her intention to review the 28-day limit on detaining terrorist suspects without charge. In mid-July 2010, the second major gun incident during May's term took place in the north of England: a week-long police operation failed to capture and arrest Raoul Moat, an ex-convict who shot three people, killing one. The suspect later shot himself dead. During the incident, Moat was shot with a long-range taser. It later transpired that the firm supplying the taser, Pro-Tect, was in breach of its licence by supplying the police directly with the weapon. Its licence was revoked by the Home Office after the Moat shooting. On 1 October 2010 the BBC reported that the director of the company, Peter Boatman, had apparently killed himself over the incident.

In August 2010, May banned the English Defence League (EDL) from holding a march in Bradford, West Yorkshire, on 28 August. The EDL protested against the ban, claiming they planned a "peaceful demonstration". Around 2 pm on the day of the ban, violent disturbances in Bradford between EDL members and their opponents were reported, calling for intervention by riot police.

On 9 December 2010, in the wake of violent student demonstrations in central London against increases to higher-education tuition fees, May praised the actions of the police in controlling the demonstrations but was described by The Daily Telegraph as "under growing political pressure" due to her handling of the protests.

In December 2010, May declared that deployment of water cannon by police forces in mainland Britain was an operational decision which had been "resisted until now by senior police officers". She rejected their use following the widespread rioting in summer 2011 and said: "the way we police in Britain is not through use of water cannon. The way we police in Britain is through consent of communities." May said: "I condemn utterly the violence in Tottenham. ... Such disregard for public safety and property will not be tolerated, and the Metropolitan Police have my full support in restoring order." She returned to the UK from holiday to meet senior police officials on 8 August.

In the aftermath of the riots May urged the identification of as many as possible of the young criminals involved. She said: "when I was in Manchester last week, the issue was raised to me about the anonymity of juveniles who are found guilty of crimes of this sort. The Crown Prosecution Service is to order prosecutors to apply for anonymity to be lifted in any youth case they think is in the public interest. The law currently protects the identity of any suspect under the age of 18, even if they are convicted, but it also allows for an application to have such restrictions lifted, if deemed appropriate." May added that "what I've asked for is that CPS guidance should go to prosecutors to say that where possible, they should be asking for the anonymity of juveniles who are found guilty of criminal activity to be lifted."

May launched an inquiry into the phone-hacking scandal; tabloid paper journalists had been jailed in 2009 for intercepting the mobile phone messages of major public figures. The case involved a journalist employed by former News of the World editor Andy Coulson, who had later become director of communications for Prime Minister David Cameron. (Coulson was absolved of any role in the hacking incidents during a House of Commons enquiry in 2009.) Labour Party leadership candidate Ed Balls called on May to make a statement to the House on the matter. On 5 September, May told the BBC that there were "no grounds for a public enquiry". The Metropolitan Police said it might consider re-examining evidence on the allegations. On 6 September 2010, May faced parliamentary questions over the allegations following an intervention by the Speaker of the House of Commons, John Bercow.

At the Conservative Party Conference on 4 October 2011, while arguing that the Human Rights Act needed to be amended, May gave the example of a foreign national who the Courts ruled was allowed to remain in the UK, "because—and I am not making this up—he had a pet cat". In response, the Royal Courts of Justice issued a statement, denying that this was the reason for the tribunal's decision in that case, and stating that the real reason was that he was in a genuine relationship with a British partner, and owning a pet cat was simply one of many pieces of evidence given to show that the relationship was "genuine". The Home Office had failed to apply its own rules for dealing with unmarried partners of people settled in the UK. Amnesty International said May's comments only fuelled "myths and misconceptions" about the Human Rights Act and Justice Secretary Kenneth Clarke subsequently called May's comments "laughable and childlike".

In June 2013, May signed an order prohibiting Pamela Geller and Robert Spencer, two American bloggers who co-founded the anti-Muslim group Stop Islamization of America, from entering the United Kingdom on the basis that their presence would not be "conducive to the public good". The pair had been invited to attend an English Defence League march at Woolwich, where Drummer Lee Rigby had been killed earlier that year. The pressure group Hope not Hate led a campaign to exclude the pair, whom the Home Office described as "inflammatory speakers who promote hate".

May supported the Metropolitan Police's detention of David Miranda (partner of journalist Glenn Greenwald, who at the time of the detention worked for The Guardian) under the Terrorism Act 2000, saying that critics of the police action needed to "think about what they are condoning". Lib Dem peer and former Director of Public Prosecutions Ken Macdonald accused May of an "ugly and unhelpful" attempt to implicate those who were concerned about the police action of "condoning terrorism". The High Court subsequently acknowledged there were "indirect implications for press freedom" but ruled the detention lawful. A 2016 ruling by the Court of Appeal found that the provision of the Terrorism Act used for Miranda's detention was "incompatible with the European convention on human rights", but that the detention itself was lawful.

On 29 August 2014, the British government raised the terrorist threat level to "severe", as Prime Minister David Cameron and May warned a terrorist attack was "highly likely" following the coming to prominence of the Islamic State of Iraq and the Levant. May said that there was no intelligence warning of an imminent attack.

Police and crime On 26 July 2010, May announced a package of reforms to policing in England and Wales in the House of Commons. The previous Labour Government's central crime agency, SOCA (Serious Organised Crime Agency), was to be replaced by a new National Crime Agency. In common with the Conservative Party 2010 general election manifesto's flagship proposal for a "Big Society" based on voluntary action, May also proposed increasing the role of civilian "reservists" for crime control. The reforms were rejected by the opposition Labour Party.

Following the actions of a minority of black bloc in vandalising allegedly tax-avoiding shops and businesses on 26 March, the day of a march by the TUC, May unveiled reforms curbing the right to protest, including giving police extra powers to remove masked individuals and to police social networking sites to prevent illegal protest without police consent or notification.

In July 2013, May welcomed the fact that crime had fallen by more than ten percent under the coalition government, while still being able to make savings. She said that this was partly due to the government removing red tape and scrapping targets to allow the police to concentrate on crime fighting.

In 2014, May delivered a well-known speech to the Police Federation, in which she criticised many aspects of the culture of the police force. In the speech, she said: