Surveillance without the use of bugging or video equipment is generally permitted.
Surveillance with the assistance of technical means (voice or image recording)/tracking of a person is admissible, when it is necessary for the investigation of a catalogue of crimes: drug trafficking, terrorism, terrorism financial support, weapons trafficking, corruption, trading in influence, money laundering, conspiracy to commit crimes, smuggling, theft and trafficking of vehicles, money counterfeiting, traffic of human beings, exploration of prostitution, embezzlement, misappropriation or other diversion of property by a public official, fraud regarding EU funding, financial crimes committed through the use of technology, transnational or international financial crimes, counterfeiting, possession, use, unlawful appropriation of cards or other non-cash payment instruments, acquisition of cards and other non-cash payment instruments through cybercrimes, software and other data damage, cyber sabotage and unauthorised computed access, if this access allowed to obtain confidential information or a profit of at least 20.400 €, was executed through instruments and actions, stablished in cybercrime law.