Bismihi Subhanahu Wa-ta’ala
Assalamooalaikum Warahmatullahi Wabarakatuh
Respected Sister or Brother
Certification
It should be understood that just because a butcher stored does not have certification, it does not necessarily follow that their meat is Haraam or even doubtful. Since, you have HMC accrediting quite a few of your butchers, you should endeavour to buy from those certified by an Ulama co-ordinated organisation. Without doubt, non-stunned meat is more wholesome than stunned.
With reference to HMC, they follow a policy to provide certification process to those not stunning. The reason may be to make the public more determined and resolute consequently forcing Muslim companies to abandon stunning altogether which is a good thing. Nonetheless, though the act of stunning animals is in itself Makruh-e-Tahrimi (where there is no need) though it does not necessarily render the meat Haraam. It would of course depend on the animal being killed or not in the stunning process to render it Haraam however if the voltage is low then poultry would not die in the process. They would simply become groggy enough for the slaughterers to complete the Islamic Dhabah. The issue with poultry and stunning is prominent as they are small and if the current is high then the chicken may die in the stunning process which would prove problematic.
