Sacred Cows

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Arent cows sacred in India? If this is true, lets say some hit a cow while driving on the busy streets of Calcutta, ( Im pretty sure the cows get to walk around freely),would that person be charged? I mean are the cows protected in some kind of way? Im not trying to be funny, Im just interested. How sacred is the cow. Oh I dont know if this is an urban legend or not but do people drink cow urine to heal disease?