Evidence of other crimes may be admitted, however, if it is substantially relevant to some contested issue in the case and if it is not offered to prove the defendant’s guilt based on propensity to commit crime or his character as a criminal. Ross, 276 Md. at 669, 350 A.2d at 684; see generally C. McCormick, Evidence § 190 (E. Cleary 3d ed. 1984); L. McLain, supra, § 404.5, at 353.
Thus, there are numerous exceptions to the general rule that other crimes evidence must be suppressed. Evidence of this type may be admitted if it tends to establish motive, intent, absence of mistake, a common scheme or plan, identity, opportunity, preparation, knowledge, absence of mistake or accident. See Ross at 669-670, 350 A.2d at 684; C. McCormick, supra, § 190, at 558-564; L. McLain, supra, § 404.5, at 353. But, because of the potential danger involved, the admission of other crimes evidence “should be subjected to rigid scrutiny by the courts____” Ross at 671, 350 A.2d at 685. Additionally, the evidence proffered to the trial judge must be clear and convincing in establishing the accused’s involvement in the other crimes. Cross, 282 Md. at 478, 386 A.2d at 764.
When a trial court is faced with the need to decide whether to admit evidence of another crime — that is, evidence that relates to an offense separate from that for which the defendant is presently on trial — it first determines whether the evidence fits within one or more of the Ross exceptions. That is a legal determination and does not involve any exercise of discretion. See Cross, 282 Md. at 474, 386 A.2d at 761; Moore v. State, 73 Md.App. 36, 44, 533 A.2d 1, 5 (1987), cert. denied, 311 Md. 719, 537 A.2d 273 (1988).
If one or more of the exceptions applies, the next step is to decide whether the accused’s involvement in the other crimes is established by clear and convincing evidence. Lodowski v. State, 302 Md. 691, 728, 490 A.2d 1228, 1247 (1985), defendant’s petition for cert. denied, 475 U.S. 1086, 106 S.Ct. 1469, 89 L.Ed.2d 725, vacated, 475 U.S. 1078, 106 S.Ct. 1452, 89 L.Ed.2d 711, rev’d on other grounds, 307 Md.