The recent rulings by the European Court of Human Rights in two cases concerning secret detention in Poland are remarkable, not the least because their bold approach in respect of human rights violations committed by a third party, in this case the United States of America. Of course, the US is not a party to the European Convention on Human Rights and was not a participant in the proceedings. In both cases Poland was found to have violated a number of ECHR provisions, including articles 3 and 5, by hosting a CIA black site and by otherwise participating in the US programme of secret detention and extraordinary renditions.
In paragraph 516 of Al Nashiri v. Poland (Application no. 28761/11, Chamber Judgment of 24 July 2014), the Court concludes:
In view of the foregoing, the Court concludes that the treatment to which the applicant was subjected by the CIA during his detention in Poland at the relevant time amounted to torture within the meaning of Article 3 of the Convention (…).
The same conclusion appears in paragraph 511 of Husayn (Abu Zubaydah) v. Poland (Application no. 7511/13, Chamber Judgment of 24 July 2014). Immediately after the finding on torture by the US, the Court makes its finding in respect of Poland (Al Nashiri para. 517).:
Accordingly, the Polish State, on account of its “acquiescence and connivance” in the HVD Programme must be regarded as responsible for the violation of the applicant’s rights under Article 3 of the Convention committed on its territory …
One may ask whether the ECtHR through its formulations in paras. 516-517 created a situation where the US was an indispensable third party, to the effect that the finding in respect of the lawfulness of conduct by the US was a prerequisite for a conclusion in relation to Poland, even if the Court obviously did not consider the US participation in the proceedings (or consent to its jurisdiction) to be indispensable.