If the judgment becomes final before the effective date of this rule, the time for filing the motion shall commence upon the effective date of this rule. If the motion qualifies under one of the foregoing exceptions to the three year time limit, the motion shall be filed within three years after the event establishing the exception occurred. Nothing in this section shall preclude the Commonwealth from relying upon the defense of laches to bar a motion upon the ground of unreasonable delay in filing when the delay has prejudiced the Commonwealth’s opportunity to present relevant evidence to contradict or impeach the movant’s evidence.
Ky. R. Crim. P. RCr 11.42