The rules gathering such queries are outlined in the Regulation of Investigatory Powers Act (RIPA).
The man is also being questioned on suspicion of breaching the Regulation of Investigatory Powers Act.
British law already allows police to remotely access computers under the Regulation of Investigatory Powers Act 2000, which allows surveillance to "prevent or detect serious crime".
Such questions will soon come to the fore in Britain, where, from October 24th, the Regulation of Investigatory Powers Act will allow companies to monitor all their employees' e-mails.
Brussels said this showed that UK laws, particularly The Regulation of Investigatory Powers Act, did not do enough to protect data about the e-mails and web browsing habits of citizens.
As well as the DfT, this included 27 councils and one public authority, who all paid private firms to undertake surveillance using powers under the Regulation of Investigatory Powers Act (Ripa).
Mr Bowden, former chief privacy adviser to Microsoft Europe, made a name for himself as a privacy advocate when the controversial Regulation of Investigatory Powers Act (RIPA) came into force in the UK in 2000.
He cites the Regulation of Investigatory Powers Act of 2000, the law used to imprison News of the World reporter Clive Goodman and private investigator Glenn Mulcaire, who teamed up to invade the voicemail accounts of various celebrities.
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The government has said it wants to increase the scope of the Freedom of Information Act and is considering new curbs on the Regulation of Investigatory Powers Act - which it brought in - after revelations about some local councils using it to spy on minor offenders.
In the UK, the availability of cheap GPS devices, and a mistaken belief that it was permitted under the Regulation of Investigatory Powers Act, led to covert tracking being used by public authorities, including local councils "without properly considering the application of the legislation, " according to watchdog the Surveillance Commissioners.
Critics have warned that any new law could end up being used more widely than originally intended - similar to the controversial Regulation of Investigatory Powers Act, which has not just been used to tackle serious crime by police but also been used by local authorities to check on children's school catchment areas.
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