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A recent Missouri Court of Appeals decision has clarified the law, saying it is not a criminal offense to carry a firearm into the airport or through airport security if you are a concealed carry permit holder.
"It clearly says now from the court of appeals if you carry a firearm into Lambert, you can be asked to leave, possibly subject to a fine, but you can't be arrested and charged for unlawful use of a weapon if you are a conceal carry permit holder," said Matt Fry, Partner at Rosenblum and Fry.
Fry said many of the cases he's represented before this court opinion were with people who forget they have their gun on them while they were at the airport or made their way to security. They ended up being charged with unlawful use of a weapon when they should not have been.