Reply To: Can a “Kosher” Restaurant Advertise it also is “Halal”

Ubi and Neville, that’s a chumra. You might call it mehadrin. In fact, at one time in EY they decided to require that the shochet say “Alla-hu akbar” (Gd is great) before schechting. A shochet whose parnassa would be affected asked if he could say it. Rav Kook said that he should try to get out of it but if he could not he could say it.
As for your co-worker, Ubi, maybe he should ask Sheikh Google Ibn Wifi Al Internetee. There are also Imam Facebook and Moulana Twitter. Just look on Google. There are also various sites for fatwas.