I vaguely remember being told a few years back, (but my memory may be a little off), that one of the reasons police ask a suspect to repeat their "story" multiple times during an interrogation process, is

1) If the multiple recollections are perfectly in sync, this suggests a story that has been practiced by the suspect, and therefore suggests potential falsehood, but

2) It is hard to remember a lie, especially one made up on the spot, so if the multiple recollections by the suspect are out of sync "enough", this also suggests falsehood.

Question - Therefore is there essentially a "range" of inaccuracy during multiple recollections by a suspect that suggest truth is being told. i.e. A goldilocks zone, if you will; were the suspects multiple story recollection are not too accurate, but also are not too inaccurate.

Is this a thing, and what is it called?

Thank you in advance.