Dave Cullen, author of "Columbine," discusses the Parkland, Fla., shooting survivors and says that while he doesn't foresee the protests slowing, he's not sure they'll lead to lasting change. For the full interview, [click here](https://cheddar.com/videos/from-columbine-to-parkland-a-journey-of-gun-reform).

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Election Offices Sent Envelopes With Fentanyl or Other Substances
Authorities on Thursday were trying to determine who sent letters filled with fentanyl or other substances to local election offices, an attack that appears to have targeted multiple states in the latest instance of threats faced by election workers around the country.
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