When the crime is punished by a special law, as a rule, intent to commit the crime is not necessary. It is sufficient that the offender has the intent to perpetrate the act prohibited by the special law. Intent to commit the crime and intent to perpetrate the act must be distinguished. A person may not have consciously intended to commit a crime; but he did intend to commit an act, and that act is, by the very nature of things, the crime itself. In the first (intent to commit the crime), there must be criminal intent; in the second (intent to perpetrate the act) it is enough that the prohibited act is done freely and consciously.

In the present case, a distinction should be made between criminal intent and intent to possess. While mere possession, without criminal intent, is sufficient to convict a person for illegal possession of a firearm, it must still be shown that there was animus possidendi or an intent to possess on the part of the accused. Such intent to possess is, however, without regard to any other criminal or felonious intent which the accused may have harbored in possessing the firearm. Criminal intent here refers to the intention of the accused to commit an offense with the use of an unlicensed firearm. This is not important in convicting a person under Presidential Decree No. 1866. Hence, in order that one may be found guilty of a violation of the decree, it is sufficient that the accused had no authority or license to possess a firearm, and that he intended to possess the same, even if such possession was made in good faith and without criminal intent.

Concomitantly, a temporary, incidental, casual, or harmless possession or control of a firearm cannot be considered a violation of a statute prohibiting the possession of this kind of weapon, such as Presidential Decree No. 1866. Thus, although there is physical or constructive possession, for as long as the animus possidendi is absent, there is no offense committed.