State v. Tiffany Johnson, 356 P.3d 438

Johnson was charged with fourth-offense DUI (felony) based on three prior DUI convictions, including a 2003 Livingston City Court conviction.
After conviction at a bench trial for fourth-offense DUI per se, Johnson moved to dismiss or reduce the charge, arguing the 2003 conviction was constitutionally infirm because she was not informed of the right to counsel.
At an evidentiary hearing Johnson submitted only a sworn affidavit recounting the 2003 proceeding and did not call other witnesses.
The State, with leave of the court, called Johnson to testify about the affidavit; defense counsel objected that she should not be compelled to testify.
The District Court limited cross-examination to the affidavit’s contents; Johnson testified and the court found her credibility undermined. The motion to dismiss/amend was denied and sentence imposed.
On appeal, the Montana Supreme Court affirmed, holding that submitting an affidavit on the dispositive issue waived the right to refuse cross-examination of the affidavit’s contents and that Johnson suffered no prejudice.

Issue	Johnson's Argument	State's Argument	Held
Whether submitting a sworn affidavit in support of a collateral attack waives the right to remain silent and subjects the affiant to cross-examination	An affidavit is not equivalent to oral testimony; submitting one does not waive the Fifth Amendment/Article II §25 right because affidavits are written and typically not subject to cross-examination	No functional distinction for purposes of an evidentiary hearing: when affidavit is the sole, dispositive evidence, fairness requires cross-examination; submitting it waives the right to refuse to testify on its contents	Court held that by submitting the affidavit on the dispositive issue, Johnson could not avoid cross-examination; compelling testimony or striking the affidavit were proper options and no prejudice resulted to Johnson

State v. Wilson, 193 Mont. 318, 631 P.2d 1273 (1979) (a defendant who testifies cannot then refuse cross-examination on matters raised by that testimony)
Brown v. United States, 356 U.S. 148 (1958) (a party who puts testimony in issue cannot claim the privilege against cross-examination on that testimony)
State v. Bromgard, 285 Mont. 170, 948 P.2d 182 (1997) (postconviction collateral attack is civil in nature)
U.S. v. Dibble, 429 F.2d 598 (9th Cir. 1970) (observing that affidavits differ from oral testimony because affiants are not subject to cross-examination)