ex post facto laws are 1) statutes that make an act punishable as a crime when such act was not an offense when committed; 2) laws which, while not creating new offenses, aggravate the seriousness of a crime; 3) statutes which prescribes greater punishment for a crime already committed; or, 4) laws which alter the rules of evidence so as to make it substantially easier to convict a defendant. 25

Does the Treaty's retroactive application violate the Constitutional prohibition against ex post facto laws? Early commentators understood ex post facto laws to include all laws of retrospective application, whether civil or criminal. 23 However, Chief Justice Salmon P. Chase, citing Blackstone, The Federalist and other early U.S. state constitutions in Calder vs. Bull 24 concluded that the concept was limited only to penal and criminal statutes. As conceived under our Constitution, ex post facto laws are 1) statutes that make an act punishable as a crime when such act was not an offense when committed; 

2) laws which, while not creating new offenses, aggravate the seriousness of a crime; 

3) statutes which prescribes greater punishment for a crime already committed; or, 

4) laws which alter the rules of evidence so as to make it substantially easier to convict a defendant. 25 

"Applying the constitutional principle, the (Court) has held that the prohibition applies only to criminal legislation which affects the substantial rights of the accused." 26 This being so, there is no absolutely no merit in petitioner's contention that the ruling of the lower court sustaining the Treaty's retroactive application with respect to offenses committed prior to the Treaty's coming into force and effect, violates the Constitutional prohibition against ex post facto laws. As the Court of Appeals correctly concluded, the Treaty is neither a piece of criminal legislation nor a criminal procedural statute. "It merely provides for the extradition of persons wanted for prosecution of an offense or a crime which offense or crime was already committed or consummated at the time the treaty was ratified." 27

In signing the Treaty, the government of the Philippines has determined that it is within its interests to enter into agreement with the government of Australia regarding the repatriation of persons wanted for criminal offenses in either country. The said Treaty was concurred and ratified by the Senate in a Resolution dated September 10, 1990. Having been ratified in accordance with the provision of the 1987 Constitution, the Treaty took effect thirty days after the requirements for entry into force were complied with by both governments.

FIRST DIVISION

G.R. No. 113213 August 15, 1994

PAUL JOSEPH WRIGHT, petitioner, 
vs.
HON. COURT OF APPEALS, HON. JUDGE JOSE DE LA RAMA, RTC, BRANCH 139, MAKATI, M.M. and HON. FRANK DRILON, SECRETARY OF JUSTICE, respondents.