Walaikumassalam Warahmatullahi Wabarakatuhu,

We cannot comment on the standards and policies of any other certifier and we do not have such a list of certifiers as inquired in your question. We suggest that you reach out to the certifier(s) directly to get details of their standards and policies in writing. For reviewing our standards and policies please review the details listed on www.shariahboard.org/certified-listings under the Halal Zabiha section or by visiting www.hmsusa.org.  

In addition, review our database of questions by using the search functionality on our website to review existing questions and answers about impermissibility of machine slaughter, ruling about meats and poultry slaughtered by ahlay-kitab etc. 

Wassalam