DUBLIN — A narcotics sales investigation into a convicted felon culminated Thursday in the 49-year-old woman’s arrest in Dublin, as well as the seizure of three kilograms of cocaine and $15,900 in cash, authorities said.

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The U.S. Drug Enforcement Agency served a warrant on behalf of the Alameda County Sheriff’s Office at a residence on Markleeville Road, according to the sheriff’s office.

The woman, who was on federal probation, was at the home with her small child, the sheriff’s office said.

In addition to the drugs and money, authorities recovered two assault rifles, one handgun, scales, packaging materials, kilogram wrappers with cocaine residue and evidence consistent with the manufacturing of cocaine base, according to the sheriff’s office.

The woman was booked i

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