Sold gun 3 years before used in a crime, but thanks to his immaculate record keeping, they found 4 sales to prohibited persons. And to add to it, they hit him for not reporting profit from sales, and not running NICS even though he could not legally access it.
Man Who Sold Midland/Odessa Shooter AR-15 Used in Massacre Sentenced for Unlicensed Firearms Dealing | Bureau of Alcohol, Tobacco, Firearms and Explosives (atf.gov)
Man Who Sold Midland/Odessa Shooter AR-15 Used in Massacre Sentenced for Unlicensed Firearms Dealing | Bureau of Alcohol, Tobacco, Firearms and Explosives (atf.gov)