This act covers investigation, surveillance and interception of communication by public bodies. For example, the secret service can wire-tap online conversations (in the interest of national security) given a warrant has been issued.
This act also enforces some laws on internet service providers and mobile phone companies such as:
upon request, information must be given up to authorised authorities
networks must have sufficient hardware to facilitate surveillance
This act is controversial as it extends to small agencies like local councils. In addition, some people feel that the act is an invasion of privacy.