The United States Supreme Court in two landmark cases(Heller and McDonald) made it clear that American’s have the right to possess and carry arms. They have applied the Second Amendment to every state and local jurisdiction.
That means people arrested for simply carrying or possessing firearms, knives and other weapons in common usage are engaged in constitutional protected activity There are some 25,000 laws on the books and many of them are now unenforceable.
Those people wrongfully arrested now have an open door at every Federal District courthouse in America to file lawsuits claiming a violation of their Civil Rights under USC:1983. The individual arresting officers all have a real risk of personal liability! Indemnification by their employer may not be allowed in many cases.
The federal courts can be expected to issue injunctions order awards for damages and attorney's fees.
Politicians like Richard M. Daley and the police chiefs they appoint will offer their cops up like lambs to the slaughter demanding they enforce unenforceable laws. Why should cops risk their children’s college funds to satisfy public officials that defy the law of the land?
Every police organization in the country needs to get a legal opinion from their lawyers on this entire subject. Remember you take an oath to defend the Constitution rather than the illegal orders of your superiors. That, “I was only following orders” defense does not work in any American court.
The simple carrying of a concealed weapon is no longer a crime in America especially in jurisdictions that deny permits or have no shall issue style permits.