It's not "my" group, nor is it in Detroit. However, the largest concentration of Muslims in the country is here and they use that website as a guide to Halal. All of them, because Halal standards are Sharia. Although each sect may take or disregard standards, that website uses the strongest.
And no, if you want your meat to the strictest Halal standard, Kosher won't cut it. Unless the Jew butchering is willing to pronounce "Bismillah al Raḥmān Al Raḥīm" over the meat.
Never imagined that happening ~ I was referring to a farm where folks go who want to BUTCHER THEIR OWN ~ you know, the old fashioned way.