5.  On 12 April 2002 the local police sent to the local investigations committee audio recordings of telephone conversations between the applicant and several persons, and video recordings of their meetings in a flat in Novgorod. The accompanying letter, which the Government presented to the Court, stated that the audio and video recordings had been obtained in the course of covert “operational-search” measures (“оперативно-розыскные мероприятия”) authorised by the President of the Novgorod Regional Court on 19 July and 31 August 2000 and 17 and 27 February 2001. 6.  On 16 April 2002 the applicant was arrested and charged with several counts of drug trafficking committed by an organised criminal group. Four more persons were arrested on the same charge. 7.  On 18 April 2002 the Novgorod Regional Prosecutor’s Office ordered the applicant’s placement in custody pending trial. He remained in custody throughout the criminal proceedings. 8.  The applicant learned about the audio and video recordings on an unspecified date while studying the criminal case file. 9.  On 26 June 2002 the investigation was completed and the case was sent for trial to the Novgorod Town Court. 10.  On 18 July 2002 counsel of one of the defendants asked that the trial be adjourned until September 2002 because he would be on annual leave until 6 September. 11.  On 20 August 2002 the Novgorod Town Court scheduled the first hearing for 16 September 2002. The hearing of 16 September 2002 was adjourned until 23 September 2002 because the applicant’s counsel was in hospital and because the prosecution witnesses did not appear. The trial eventually started on 20 November 2002. 12.  At the trial the applicant pleaded not guilty. He claimed, in particular, that the audio and video recordings were inadmissible as evidence as they had been obtained without prior judicial authorisation. 13.  His co-defendants pleaded guilty. They testified that the applicant was the leader of an organised group dealing in drugs. The applicant and another defendant, Mr K., had rented a flat where the members of the group had met to receive instructions from the applicant and to distribute the profits. They had also packaged and stored drugs in the flat. The owner of the flat testified that he had rented his flat to Mr K. and that on several occasions the rent had been paid by the applicant. 14.  On 24 November 2004 the Novgorod Town Court found the applicant and his co-defendants guilty of drug trafficking. It found it established that the applicant was the leader of an organised criminal group dealing in drugs. It relied on witness testimony, expert reports, audio recordings of telephone conversations between the defendants and video recordings of their meetings in the rented flat. It found that the recordings were admissible as evidence because they “had been obtained in the course of authorised covert operational-search measures aiming at uncovering criminal acts committed by Zubkov and the criminal group organised by him”. The applicant was sentenced to nine years and six months’ imprisonment. 15.  In his appeal submissions the applicant complained, in particular, that the audio and video recordings had been obtained without prior judicial authorisation. 16.  On 8 February 2005 the Novgorod Regional Court upheld the judgment on appeal. It repeated verbatim the Town Court’s finding that the audio and video recordings were admissible as evidence because they “had been obtained in the course of authorised covert operational-search measures aiming at uncovering criminal acts committed by Zubkov and the criminal group organised by him”. 17.  The applicant worked as an investigator at the Prosecutor General’s Office. 18.  On 6 April 2004 he was arrested and charged with aiding and abetting bribery. 19.  On 29 October 2004, while studying the criminal case file, the applicant discovered that it contained audio recordings of his telephone conversations during the period from November 2003 to March 2004. 20.  The criminal case file also contained a letter of 21 October 2004 from the Federal Security Service to the local prosecutor stating that the audio recordings had been obtained in the course of covert operational‑search measures authorised by the Tver Regional Court in its decisions nos. 55-21, 55-30, 55-76, 55-93 and 55-103. Given that they were classified documents, the decisions could not be shown to the prosecutor and would be shown to the trial court only at its request. 21.  During the trial the applicant pleaded not guilty. He argued, in particular, that the audio and video recordings were inadmissible as evidence because the case file did not contain a copy of the judicial authorisation. The prosecutor stated in reply that the interception of his telephone communications had been authorised by the Tver Regional Court. A copy of the authorisation had not been included in the case file because it was confidential. 22.  On 14 May 2005 the Regional Court convicted the applicant of aiding and abetting bribery and sentenced him to three years’ imprisonment. The court relied, among other things, on the audio recordings of his telephone conversations. The court rejected the applicant’s argument that the audio recordings were inadmissible as evidence, finding that “the examination of the material in the case file [had] permitted [the court] to establish that the evidence [had been] obtained in accordance with the Code of Criminal Procedure and the Operational-Search Activities Act”. 23.  The applicant appealed. He submitted that the Regional Court had not given reasons for its finding that the audio recordings were admissible as evidence. In particular, it had not examined whether the interception of his telephone conversations had been duly authorised by a court and carried out in accordance with the procedure prescribed by law. 24.  On 7 December 2005 the Supreme Court of Russia upheld the judgment on appeal. The court did not specifically address the applicant’s argument that the audio recordings were inadmissible as evidence. It held that the finding of guilt had been based on evidence which had been properly analysed and assessed by the Regional Court. The applicant received the decision on 7 March 2006. 25.  On 5 July 2006 the Frunzenskiy District Court of Vladimir ordered the applicant’s detention on charges of fraud. The applicant was absent from the hearing but his counsel attended. On 14 July 2006 the Vladimir Regional Court upheld the detention order on appeal. The applicant was absent also from the appeal hearing, which was again attended by his counsel. 26.  On 3 November 2006 the Frunzenskiy District Court extended the applicant’s detention until 5 January 2007. On 7 November 2006 the applicant appealed. On 5 December 2006 the Vladimir Regional Court found that there were no reasons to vary the preventive measure and upheld the decision of 3 November 2006. 27.  The applicant’s detention was further extended on several more occasions. 28.  In the period from 14 September 2006 to 12 January 2007 the applicant was detained in four remand prisons. According to the applicant, all four remand prisons were overcrowded. 29.  From 14 to 22 September 2006 the applicant was held in remand prison IZ-67/1 in Smolensk. Cell 196 measuring 15 sq. m was equipped with eight sleeping places and accommodated up to sixteen inmates. 30.  From 25 to 28 September 2006 the applicant was held in remand prison 76/1 in Yaroslavl. Cell 133 measuring 9 sq. m was equipped with seven sleeping places and accommodated up to eight inmates. 31.  From 29 September to 1 October 2006 the applicant was held in remand prison 43/1 in Kirov. His cell measuring 50 sq. m was equipped with forty sleeping places and accommodated up to twenty inmates. The cell was equipped with wooden boards instead of individual beds. 32.  From 2 October 2006 to 12 January 2007 the applicant was held in remand prison 33/1 in Vladimir. Cell 63 measuring 14 sq. m was equipped with four sleeping places and accommodated up to five inmates. 33.  On 28 and 29 September 2006 the applicant was transported by rail between remand prison IZ-76/1 and remand prison IZ-43/1 from Yaroslavl to Kirov. The train compartment was equipped with seven sleeping places and accommodated up to ten inmates. 34.  On 1 and 2 October 2006 the applicant was transported by rail between remand prison IZ-43/1 and remand prison IZ-33/1 from Kirov to Vladimir. The train compartment was equipped with seven sleeping places and accommodated up to twelve inmates. 35.  On 25 December 2006 the applicant started to study the criminal case file and discovered that it contained audio recordings of his telephone conversations between 22 and 25 July 2004. 36.  On 2 February 2007 the applicant asked the investigator for a copy of the judicial decision authorising the interception. On the same day the investigator refused his request. Relying on the Interior Ministry’s Order no. 336 of 13 May 1998 (see paragraph 54 below), he replied that the police were not required to send the interception authorisation to the investigator; it was to be kept in the operational search file. The Vladimir Regional Court’s decisions of 28 May and 2 June 2004 authorising interception of the applicant’s telephone communications were stored by the local police. They were classified documents and neither the applicant nor his counsel, who had no security clearance, could be granted access to them. 37.  On 6 February 2007 the applicant complained to the Frunzenskiy District Court of Vladimir that the interception of his telephone communications had been unlawful, in particular because the case file did not contain a judicial authorisation. He submitted that the refusal to give him a copy of the interception authorisation had frustrated him in the exercise of his defence rights and deprived him of an effective remedy against an interference with his rights guaranteed by Articles 23 and 24 of the Constitution and Article 8 of the Convention. In particular, he had been unable to ascertain whether the interception authorisation had been issued by a competent court in accordance with the procedure prescribed by law, whether it had been based on relevant and sufficient reasons or whether the requirements for judicial authorisation, such as the authorised duration of interception, had been complied with at the implementation stage. 38.  On 19 February 2007 the Frunzenskiy District Court examined the complaint under Article 125 of the Code of Criminal Procedure (see paragraph 63 below) and rejected it. Relying on section 12 of the Operational-Search Activities Act (see paragraph 49 below), the court held that the judicial decision authorising operational-search measures and the material that served as a basis for that decision were to be held in the exclusive possession of the State agency performing such measures. It had therefore not been included in the criminal case file and the defendant was not entitled to have access to it. The court further referred to the Constitutional Court’s ruling of 14 July 1998, holding that the person whose communications were to be intercepted was not entitled to participate in the authorisation proceedings or to be informed about the decision taken (see paragraph 50 below). The refusal to give the applicant a copy of the judicial authorisation had therefore been lawful. The court also rejected the applicant’s complaint about the unlawfulness of the interception, without giving any reasons. 39.  On 3 April 2007 the Vladimir Regional Court upheld the decision of 19 February 2007 on appeal, finding it lawful, well reasoned and justified.