Insubordination grounds for no unemployment?

If a person living and working in the state of Virginia is terminated for "insubordination" after 6 years of excellent behavior, would they then be ineligible to receive unemployment compensation?

[AFFA]

I wish to inform you that if a person is terminated for insubordination then it can be a ground for no unemployment but in this the person can show that charge against the person is not correct or that the person is provoke or any other fact which provides that person was not at fault. In this regard the if person is terminated because of no fault of his then he is eligible for unemployment benefits. If you were not given any notice regarding your behavior then you may show that charges are false and you were terminated on wrong grounds.

AFF

Considering the employer has access to the paperwork and can write what they please (including untruths), how would one go about proving there was no prior warning? Wouldn't that require documentation?