KRS 61.060: Official acts may be questioned collaterally, when.

No fact officially stated by an officer in respect of a matter about which he is by law

required to make a statement in writing, either in the form of a certificate, return or

otherwise, shall be called in question, except in a direct proceeding against th e officer or

his sureties, or upon the allegation of fraud in the party benefited thereby or mistake on

the part of the officer.