Criminalist Cordelia Willis will discuss the evolution of forensic DNA testing on Oct. 10, 5:30-7:30 p.m., at the next History Happy Hour at the Campbell Museums, 51 N. Central Ave.

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A criminalist for almost 30 years, Willis has worked in many different areas of the crime lab, from controlled substances and latent fingerprints to biological evidence and shoeprints and even video and cell phone processing. She has testified as an expert witness over 90 times—including five times as a witness for the defense—has worked over 60 crime scenes and organizes regular CSI training for Bay Area law enforcement agencies.

Tickets are $25 at https://www.campbellmuseums.com/events-main.

The Friends of the Campbell Library is holding its last used book sale of the yar on Saturday, Oct

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