The husband of a Northern California mom who vanished while jogging passed a polygraph test and "has no involvement" with his wife's disappearance, the Shasta County Sheriff's Office confirmed on Wednesday.

Sherri Papini, 34, was last seen going for a jog Nov. 2 in the town of Mountain Gate in Shasta County. Her husband found her phone and investigators said they spotted her earbuds along with strands of her hair, but other clues have been few and far between.

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Her husband, Keith Papini, reported her missing when he came home from work and discovered that she hadn't picked up their two children, ages 2 and 4, from daycare.

"Sheriff's Office Detectives have confirmed his whereabouts on the day in question and there is no physical evidence at this time suggesting he had any involvement," Lt. Anthony Bertain said.

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Relatives said they believed somebody kidnapped the mother and took her out of town. Still, investigators say they're working to determine whether or not her disappearance was "voluntary," the Redding Record Searchlight reported.

Papini is described as being 5 feet 3 inches tall and weighing about 100 pounds. She was last seen wearing pink running clothes, deputies said.

The sheriff's office is dedicating nearly all its investigators to the case as well as some Redding police detectives, the newspaper added.

Officials announced a $50,000 reward for information leading to her whereabouts. Police say they have received more than 200 tips since Papini vanished.

The Associated Press contributed to this report.