§ 301. Conveyance and record as evidence. 1. The certificate of the
acknowledgment or of the proof of a conveyance, or the record, or the
transcript of the record, of such a conveyance, is not conclusive, and
it may be rebutted, and the effect thereof may be contested, by a party
affected thereby.

2. If it appears that the acknowledgment or proof was taken upon the
oath of an interested or incompetent witness, the conveyance, or the
record or transcript of the record thereof, shall not be received in
evidence until its execution is established by other competent proof,
except in a case where the title to the land conveyed or affected by
such conveyance or instrument has passed to a subsequent purchaser for a
valuable consideration.