Bradley wrested the WBO welterweight title off Pacquiao via a split decision on June 9 which sparked outrage from many observers.
Two judges scoring the fight 115-113 in favour of Bradley, with the third by the same score for the Filipino in a bout most believed the latter won handily.
Now Nevada state attorney general Catherine Cortez Masto, responding to a letter from Pacquiao's promoter Bob Arum requesting a review of the fight, says: "After conducting an initial investigation there do not appear to be any facts or evidence to indicate that a criminal violation occurred.
"Displeasure with the subjective decisions of sporting officials is not a sufficient basis for this office to initiate a criminal investigation.
"Unless evidence beyond mere displeasure is forthcoming, this matter will be considered closed."
Pacquiao moved closer to a rematch two weeks ago when the World Boxing Organisation declared their belief that he should have won the bout.