1. Although relevant, evidence is not admissible if its probative value is substantially outweighed by the danger of unfair prejudice, of confusion of the issues or of misleading the jury.
2. Although relevant, evidence may be excluded if its probative value is substantially outweighed by considerations of undue delay, waste of time or needless presentation of cumulative evidence.
3. Evidence of another act or crime which is so closely related to an act in controversy or a crime charged that an ordinary witness cannot describe the act in controversy or the crime charged without referring to the other act or crime shall not be excluded, but at the request of an interested party, a cautionary instruction shall be given explaining the reason for its admission.