NEW : Attorney General Boxer says enough evidence existed to start a criminal investigation . NEW : We will not rest until justice is done . '' Senator lauds criminal investigation launched by BP . DOJ looking into potential violations of Clean Water Act Clean Water Act of 1990 and other laws . Holder visits Gulf on 1990 to survey BP oil spill .
NEW : Attorney General Boxer says enough evidence existed to start a criminal investigation . NEW : Senator lauds criminal investigation launched by BP . DOJ looking into potential violations of Clean Water Act Clean Water Act of 1990 and other laws . Holder visits Gulf on 1990 to survey BP oil spill .