The Spectrum Investigations and Intelligence unit is responsible for enforcing wireless telegraphy legislation within the State. This includes the Wireless Telegraphy Acts 1926 to 2009, the Broadcasting and Wireless Telegraphy Act 1988, as amended, and the Radio Equipment Regulations and EMC Regulations.

Possession of apparatus for wireless telegraphy without a valid licence is an offence under Section 3 of the Wireless Telegraphy Acts 1926 to 2009, liable on summary conviction to a Class A fine not exceeding €5,000 and on conviction on indictment to a fine not exceeding €250,000.

Spectrum Investigations and Intelligence executes search warrants, issued pursuant to Section 8 of the Wireless Telegraphy Acts 1926 to 2009. Such enforcement operations typically target: unlicensed broadcasters (pirate radio stations); sellers of non-compliant radio equipment such as mobile phone repeaters; and those who refuse to cease the operation of equipment causing harmful interference.