The regulation of Investigatory Powers Act 2000 relates to the interception, acquisition and disclosure of data relating to communications, the carrying out of surveillance, the use of covert human intelligence sources and the acquisition of the means by which electronic data protected by encryption or passwords may be decrypted or accessed.

There are three main ways of surveillance and covert human intelligence

1. direct surveillance

2. intrusive surveillance

3. use of covert human intelligence sources

Non-intrusive covert surveillance can be undertaken for a specific investigation, operation or purpose. Its result is to obtain private information about a person (whether or not one specifically identified for the purposes of the investigation or operation)

Intrusive surveillance is carried out either in a residential premises or private vehicle; and involves the presence of an individual on the premises or in the vehicle or is carried out by means of a surveillance device.

Human intelligence source is inducing, asking or assisting a person to obtain information by means of the conduct of such a source. This is achieved by establishing a personal or other relationship with a person for the covert purpose and covertly discloses information obtained by the use of such a relationship, or as a consequence of the existence of such a relationship.