RP vs. Rosemoor Mining and Development Corp. (GR 149927)
there is no merit in the argument that the proclamation is an ex post facto law. There are six recognized instances when a law is considered as such: 1) it criminalizes and punishes an action that was done before the passing of the law and that was innocent when it was done; 2) it aggravates a crime or makes it greater than it was when it was committed; 3) it changes the punishment and inflicts one that is greater than that imposed by the law annexed to the crime when it was committed; 4) it alters the legal rules of evidence and authorizes conviction upon a less or different testimony than that required by the law at the time of the commission of the offense; 5) it assumes the regulation of civil rights and remedies only, but in effect imposes a penalty or a deprivation of a right as a consequence of something that was considered lawful when it was done; and 6) it deprives a person accused of a crime of some lawful protection to which he or she become entitled, such as the protection of a former conviction or an acquittal or the proclamation of an amnesty. Proclamation No. 84 does not fall under any of the enumerated categories; hence, it is not an ex post facto law.
It is settled that an ex post facto law is limited in its scope only to matters criminal in nature. Proclamation 84, which merely restored the area excluded from the Biak-na-Bato national park by canceling respondents license, is clearly not penal in character.
BOCEA vs. Hon. Margarito Teves (GR 181704)
R.A. No. 9335 does not possess the elements of a bill of attainder. It does not seek to inflict punishment without a judicial trial. R.A. No. 9335 merely lays down the grounds for the termination of a BIR or BOC official or employee and provides for the consequences thereof. The democratic processes are still followed and the constitutional rights of the concerned employee are amply protected.
Recuerdo vs. People, CA (GR 133036)
The contention that B. P. 22 is a bill of attainder, one which inflicts punishment without trial and the essence of which is the substitution of a legislative for a judicial determination of guilt, fails. For under B. P. 22, every element of the crime is still to be proven before the trial court to warrant a conviction for violation thereof.
Republic vs. Desierto (GR 136506)
to construe Section 15, Article XI of the 1987 Constitution in order to give it retroactive application to the private respondents will run counter to another constitutional provision, that is, Section 22, Article III which provides that No ex post facto law or bill of attainder shall be enacted. An ex post facto law is defined, in part, as a law which deprives persons accused of crime of some lawful protection of a former conviction or acquittal, or of the proclamation of amnesty; every law which, in relation to the offense or its consequences, alters the situation of a person to his disadvantage. A construction which raises a conflict between different parts of the constitution is not permissible when by reasonable construction, the parts may made to harmonize.
PP vs. Casta (GR 172871)
In light of the greater penalty that attaches under the amendment, the previous penalty of reclusion temporal in its maximum period to death will have to be imposed in order not to run afoul of the constitutional prohibition against ex post facto laws. Under Section 22 of Article III of the 1987 Constitution, no ex post facto law or bill of attainder shall be enacted. An ex post facto law, among others, is one that changes the penalty and inflicts a greater punishment than what the law annexed to the crime when committed – the situation that would obtain if the amendment under Republic Act No. 7659 would be applied.