Jurors deliberated for about 30 minutes before finding Stephen Haff guilty of first-degree robbery. Haff, 30, made an obscene hand gesture at the lead detective while the verdict was read.
Prosecutors alleged that Haff used a lengthy note to demand money from a teller at a US Bank inside a Marysville grocery store. Scientists at the state crime lab discovered a thumbprint on the back of the note. The print matched that of the defendant, court papers said.
Jurors also were told the one of Haff's hairs was found in a baseball cap similar to the one worn by the robber.
The defense argued that someone else could have committed the robbery and then planted evidence to frame Haff.
Haff is scheduled to be sentenced next month.
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