measure is possible in Estonia.
Code of Criminal Procedure
§ 126-5. Covert surveillance, covert collection of samples for comparison and conduct of initial investigations, covert examination and substitution of an object
(1) For conducting covert surveillance of a person, an object or area, for covert collection of samples for comparison and for conducting initial investigations, and for covert examination or substitution of an object, the Prosecutor’s Office grants an authorisation for up to two months. The Prosecutor’s Office may extend the time limit of the authorisation by up to two months at a time.
(2) In the course of covert operations mentioned in this section, collected information is – where this is needed – video recorded, photographed or copied or recorded by any other method.