MANILA — The Bureau of Internal Revenue filed before the Department of Justice, on Wednesday, a P9.5-billion tax evasion case against homegrown cigarette manufacturer Mighty Corp. for allegedly using fake tax stamps to deprive the government of excise tax payments. Since late 2014, the BIR has been implementing the Internal Revenue Stamps Integrated System on tobacco products. These stamps ensure that the correct excise taxes are paid. Nongovernment Action for Economic Reforms had pegged Mighty’s…