This happened in 2015. From an article:

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A former police officer has filed suit against a hunting and fishing store in Kentucky after shooting off his own finger when an employee gave him a loaded gun.

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“He’s had multiple surgeries, thousands of dollars in medical expenses,” Smith’s attorney, B. Alan Simpson, told The Post in a phone interview Tuesday.

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The accident at Barren Outdoors happened on March 26, when Darrell Smith asked to see a .380-caliber handgun, according to court documents. Simpson said Smith was merely curious about the gun and wanted to take a look.

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“He was not necessarily going in to buy a specific gun or something like that,” Simpson said. “He just happened to be browsing through the cases and this particular gun caught his eye.”

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The bullet passed through two fingers, and doctors couldn’t save Smith’s left index finger, Simpson said.

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“Under no circumstances should they have had a loaded weapon in a display case to start with,” Simpson said. “The first problem clearly is that whenever this gun was brought into their inventory, they never checked the weapon. And right before they handed it to Mr. Smith, they obviously never checked the weapon a second time.”

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Smith, who worked in law enforcement for about 30 years, is now unemployed, Simpson said.

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Lesson: Always be hyper-vigilant about handling guns safely even if you don't think they're loaded because there's a chance they could be. 

Officer Shoots Finger Off While Browsing Guns