The binding legal principles established are: (1) In wildlife crimes involving possession of ivory, 'possession' has a broad legal definition encompassing both physical control (corpus) and intention to control (animus), and includes actual possession, constructive possession, sole possession, and joint possession. (2) Once the state establishes both the physical element and mental element (animus) constituting possession, the onus shifts to the accused to negative mens rea, unless the enactment provides that mens rea is an element of the offense. (3) Where an accused person's own conduct and statements independently establish possession and trading in contraband, the testimony of a police informer who merely facilitated initial contact is unnecessary and irrelevant to conviction. (4) Evidence of undercover police operations is admissible where officers successfully disguise themselves as buyers and the accused voluntarily demonstrates possession and control of contraband through their own actions. (5) The credibility assessment of witnesses is primarily the domain of the trial court, and an appellate court will not interfere unless misdirection is shown. (6) In the absence of established special circumstances, courts must impose the statutory minimum mandatory sentence for wildlife offenses.