Update 28 July 2016 A Brussels Court has referred to the CJEU for interpretation of the EU Regulation, questioning whether the Regulation’s regime may itself be incompatible with the ECHR. Update 16 September 2016 the case number is C-426/16. See here for the questions referred (in Dutch).
The Belgian Council of State, chamber of legislation (in the title I call it a ‘parliamentary watchdog: for that is what it is. By issuing prior opinions on the legality of legislative initiative it guards against illegal Statute) has opined that a private members bill banning unstunned slaughter, does not pass the ECHR test.
A European Regulation (1099/2009) provides for an unclear, and conditional, exemption for religious (regularly rather offendingly called ‘ritual’) slaughter. Practised in particular by the Jewish (Shechita; leading to ‘kosher’ meat) and Muslim (Zabihah; with halal meat) faith, a core aspect of the practice is that animals are not stunned prior to slaughter. The science on the effect of stunned or unstunned slaugther is unequivocal, and most certainly neither stunned nor unstunned slaughter, when carried out incorrectly (well documented in the case of stunned slaughter) does not aid the welfare of the animal.
Religious slaughter falls squarely within the European Convention of Human Rights Article 9’s freedom of religious expression. Hence the Council of State summarily (its conciseness is rather attractive) reviews the ECtHR’s case-law and concludes that the proposed ban would be both unconstitutional and clearly against the provisions of the ECHR.
On the EU Regulation front, I believe the EU rules are more problematic than the Opinion suggests (I have analysis on it forthcoming) however on the ECHR side of things, the Opinion could not be more correct. An outright ban on unstunned slaughter in the name of animal welfare or otherwise would offend freedom of religious expression to such a degree that it simply must not pass.