Yes. But apply anyways. They don’t even look at it. They’re so desperate to fill spots.
Yes, honest information at application time was discussed during interview and because of it being 20 years ago, wasn't applicable to current offer of employment.
Evidently not, nor do they have the decency to have a one on one with you if they have concerns. Being in the corrections system, you would think they would understand the difference between facts and speculation or allegations. Very disappointing