Law Enforcement Officers Safety Act

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 or separated law enforcement officer''--to carry a concealed firearm in any jurisdiction in the United States, regardless of state or local laws, with certain exceptions.

Question: can police officers carry guns across state lines
Answer: yes