Can the state government ban cow slaughter in Kolkata and what are the exceptions under the state cow protection law?

Yes, the state can ban cow slaughter in Kolkata under West Bengal Premises Tenancy Act 1997, which prohibits slaughter of cows, calves, and bulls and bullocks above a specified age, with limited exceptions for bona fide agricultural or medical purposes. The Act prescribes penalties including imprisonment and fine, and empowers the authorities to seize vehicles and premises used for illegal slaughter. The Calcutta High Court has upheld the constitutionality of such bans subject to the reasonable classification and the exceptions for old and useless animals, and has directed that the certification of age must be by a competent veterinary officer. If you are in a genuine agricultural or medical need, you must obtain the requisite permission from the competent authority under West Bengal Premises Tenancy Act 1997 before transporting or slaughtering the animal. Keep the permission letter and the veterinary certificate, as possession or transport without the prescribed documents is a punishable offence even if the slaughter itself is within the exception.