SPOKANE, Wash. -

A Spokane judge has found a registered sex offender guilty of exposing himself to a teen at the STA Bus Plaza earlier this year.

Judge James Triplet found Billy Ogan guilty after a one-day trial in which Ogan acted as his own legal counsel.

The judge found that Ogan was being obnoxious and try to draw attention to himself when he approached the teen in the plaza's smoking area. The court went through the surveillance video second by second and conceded that while the cameras did not show body parts that Ogan's hand motions and the witnesses' testimony convinced Triplet Ogan had exposed himself to the girl.

"I have no reasonable doubt that Mr. Ogan made an open and obscene exposure of his penis … that it was intentional and not an accident or involuntary act," Judge Triplet said.

Ogan interrupted the proceedings to call the 16-year-old victim a liar.

Ogan had claimed the surveillance video, which showed him speaking to the teen victim, would exonerate him and the teen and arresting officer lied in their testimony.

The court disagreed with Ogan's defense and found him guilty of indecent exposure with sexual motivation, a gross misdemeanor that is punishable by up to 10 months in the Spokane County Jail.

The incident at the STA Bus Plaza happened shortly after Ogan was released from jail after serving a 90-day sentence for a similar conviction involving an incident on the South Hill.

Ogan, who is currently in custody, will be sentenced in July.