A "constitutional carry" gun law in Oklahoma took effect Friday.
Also known as permitless carry, the law lets some Oklahomans carry a firearm in public without a license.
Firearms are still prohibited in public buildings, bars, casinos and schools, and at professional sporting events.
Oklahoma's Supreme Court and a county judge this week rejected Oklahoma City Democratic Rep. Jason Lowe's requests to hold off on the law.
The petition would have stopped the law from taking effect and made it a 2020 ballot question, had it been successful.
The Oklahoma Second Amendment Association filed a protest against the petition that rendered its signatures invalid.
There are at least 16 states that have some version of a permitless carry law, according to the National Rifle Association (NRA). »