The Law Enforcement Officers Safety Act (LEOSA) is a United States federal law, enacted in 2004, that allows two classes of persons—the "qualified law enforcement officer" and the "qualified retired law enforcement officer" -- to carry a concealed firearm in any jurisdiction in the United States, regardless of any state or local law to the contrary, with certain exceptions.  Fee for this class is $50.00. 
There will be a $40.00 fee for each additional firearm you choose to qualify with.