32 Authorisation of intrusive surveillance

32  Authorisation of intrusive surveillance

(1)     Subject to the following provisions of this Part, the Secretary of State and each of the senior authorising officers shall have power to grant authorisations for the carrying out of intrusive surveillance.

(2)     Neither the Secretary of State nor any senior authorising officer shall grant an authorisation for the carrying out of intrusive surveillance unless he believes—

(a)     that the authorisation is necessary on grounds falling within subsection (3); and

(b)     that the authorised surveillance is proportionate to what is sought to be achieved by carrying it out.

(3)     Subject to the following provisions of this section, an authorisation is necessary on grounds falling within this subsection if it is necessary—

(a)     in the interests of national security;

(b)     for the purpose of preventing or detecting serious crime; or

(c)     in the interests of the economic well-being

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