They say it remains an active investigation.
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The British Auto Repair shop in Napa has a good reputation among customers. So does the owner, Ian Rogers but that may change after a court arraignment, possibly as soon as Tuesday.
"I think it is all about what is happening with the inauguration is all," said his mother, who never gave her name. "It's a precaution and they are using him as an example."
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Ian Rogers, age 44, is now in Napa County jail on $5 million bail. Sheriff's deputies say they found stockpiles of weapons and explosives in his home and business. Deputies moved on Rogers, Friday, after a tip from someone who worried that he might harm others.
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Deputies say they found more than 50 weapons including sniper rifles and semi-automatic guns, plus 15,000 rounds of ammunition, gunpowder, explosives, and five pipe bombs.
"Well, they were fireworks from Wyoming,' said Rogers' mother. "Fireworks."
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"What about the 15,000 rounds of ammunition?" asked ABC7 News reporter Wayne Freedman.
"Well he did have that, but he had it for years," answered Rogers' mom.
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She never explained a reason for that ammunition. The timing of her son's arrest comes roughly two weeks after a mob stormed the Capitol in Washington, and now two days before the most highly guarded inauguration in American history.
Former neighbors describe Rogers as a vocal Trump supporter, and a good person to have in the neighborhood.
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Nani Simbre said her son played next door every day for three years, with no issues or concerns.
She said Rogers was, "Quiet. Respectful. When kids needed help with a car he would always help us. There was nothing erratic about him."
The FBI is working this case, as well.