The two were alone in the car when the 4-year-old found Brayden's mother's unsecured gun and discharged it, fatally striking Brayden, the sheriff's office said.
A Michigan officer nearly shot a student playing a "water wars" game, the school district said.
A man who was seen on social media wandering around Philadelphia's Kensington section with an AR-style pistol is now off the streets and facing charges.
In 1927, Congress passed a law barring the USPS from mailing concealable firearms unless they were from licensed dealers in an effort to curb crime.
Two people charged in connection with a large-scale drug distribution and gun manufacturing operation in Northeast Philadelphia.
Trump's Republican administration alleges the ban violates the Constitution's Second Amendment right to bear arms.