Article 19 5.

Where communication through the decentralised IT system in accordance with paragraph 1 or 4 is not possible due to, for instance, the disruption of the decentralised IT system, the nature of the transmitted material, technical limitations, such as data size, legal constraints relating to the admissibility as evidence of the requested data or to forensic requirements applicable to the requested data, or exceptional circumstances, the transmission shall be carried out by the most appropriate alternative means, taking into account the need to ensure an exchange of information which is swift, secure and reliable, and allows the recipient to establish authenticity.