excerpt; at the end you can see what the old police chief of Poplar Bluff said (no doubt he's an evil Republican racist as he's a longtime cop with white skin!) 

[....] Kansas City Mayor Quinton Lucas told us this could not be happening at a worse time for Missouri, where the murder rate in the state is nearly twice the national average.  Before the law passed, it was routine for local police to work with their federal partners.

Norah O'Donnell: Why does local law enforcement want the help of the federal government when it comes to dealing with gun violence?

Mayor Quinton Lucas: The volume of crime. The volume of incidents. On a night in Kansas City, you can have multiple people shot. In the same way that if you have a severe storm hit a city, we bring in federal resources to help us with that crisis. This is the problem with gun violence right now in some of America's major cities. Particularly in the Midwest, particularly in Missouri.

Mayor Lucas says he's concerned that under Missouri state law, people convicted of domestic violence misdemeanors are still allowed to have a gun.

Mayor Quinton Lucas: There's been a domestic violence loophole in Missouri law for years now. The saving grace alone was that there was a federal law that a police officer could say they're violating. Now that we lose that, what does this mean for so many Missourians? So many survivors of domestic violence? I hope it doesn't make them victims.

Since 2017, the FBI has identified 744 people in Missouri convicted of a domestic violence misdemeanor who then broke federal law when they tried to buy a gun. According to the ATF, local law enforcement was key to investigating these cases on the ground in Missouri. If those same officers helped the atf with cases like that today, they would be breaking state law.

Norah O'Donnell: Are local law enforcement essentially gonna stop and think twice before trying to stop someone with an illegal gun?

Mayor Quinton Lucas: Yes. Now, if you stop someone with a firearm, you may be asking yourself, "Do I wanna be subject to litigation? Do I wanna subject my department to liability?" And in many cases the answer's going to be no.  

St. Louis and Jackson County are suing to stop Missouri's Second Amendment Preservation Act in state court. So far, without success. In southeast Missouri, police and prosecutors started a campaign to have the law changed. Chief Danny Whiteley is leading that effort.

Danny Whiteley: Something bad's gonna happen. And I'm gonna be the first one to say, "I told you so."

He's the longest-serving police chief in the history of Poplar Bluff, a small city near the Ozarks, that he says has a big city gun violence problem.

Chief Whiteley told us he's no longer working with federal prosecutors and misses the help.

Danny Whiteley: Number one, they have a lot of resources that we don't-- manpower-wise and forensics-wise. And if they get convicted in Federal Court, they're gonna do 85% of the time.

He shared with us summaries of nine recent alleged gun crimes he says he would usually refer to the nearby U.S. attorney's office for prosecution. [....]