Is it permissible for a veterinarian to work in a non-Halal chicken plant where their duty is to check the lorry of live chickens for disease?
Checking the health of the live chickens is permissible and lawful job, but helping or promoting a non Halal business is bad job which should not be done by a Muslim especially if this non Halal food is going to be sold to Muslim consumers.
Wassalam.