Last spring, Brandon Hole’s mother alerted the police in Indiana about her son’s worrying behavior. Invoking the state’s “red flag” law, officers seized his firearm.But Mr. Hole was able to legally purchase other weapons, and last week, he opened fire on a FedEx facility, killing eight people and then himself.Why did the law fail?Guest: Campbell Robertson, a national correspondent for The New York Times. Sign up here to get The Daily in your inbox each morning. And for an exclusive look at how the biggest stories on our show come together, subscribe to our newsletter. Background reading: Red flag laws are supposed to keep guns away from people who should not have them. That did not happen with Mr. Hole.Citing shortcomings of the state’s red flag law, the senior county prosecutor in Indianapolis explained why he did not seek a ruling last year that would have barred Mr. Hole from possessing guns.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.