Room surveillance on behalf of foreign authorities is possible in Sweden by using an EIO or a request for MLA (Mutual Legal Assistance) on the same grounds as it is in a domestic investigation.
In the case of secret audio recordings, a criminal investigation must be instigated by competent authorities, concerning an identified person under reasonable suspicion of having committed a crime that, in that particular case, should render at least four years of imprisonment if it had been committed in Sweden. Further, the measure must be directed against a place (home, car, hotel room, restaurant etc) where there are particular reasons to suppose that this person will stay. There is also a need to explain why these measures are deemed necessary. The request will be handled by a public prosecutor who then will apply for permission at a District Court which makes the actual decision. The police or the customs authority are competent authorities for the execution of the measures, but they need a special permit from the court in order to secretly entering and installing technical equipment.
In the case of secret video recordings, a criminal investigation must be instigated by competent authorities, concerning an identified person under reasonable suspicion of having committed a crime that, in that particular case, should render at least two years of imprisonment if it had been committed in Sweden. Further, the measure must be directed against a place where there are reasonable grounds to suppose that this person will stay. There is also a need to explain why these measures are deemed necessary. The request will be handled by a public prosecutor who then will apply for permission at a District Court which makes the actual decision. However, immediate interim decisions are possible should there be peril in delay (Periculum in mora). The police or the customs authority are competent authorities for the execution of the measures.