Defendant's conviction for possessing marijuana in a prison facility is affirmed where 1) there was nothing to suggest that the prosecutor failed to present evidence regarding drug quantity in its case-in-chief in an attempt to gain an advantage, or because the prosecutor could not have presented the evidence earlier; and 2) the trial court did not abuse its discretion in allowing an expert witness to testify on the question of the usability of the quantity of marijuana found in defendant's coin purse.