A Transportation Security Administration arm patch and shield is seen at Los Angeles International Airport, California February 20, 2014.  iREUTERS/Kevork Djansezian

Just when you think people get it, you realize they don’t.

Case in point, the Florida man, who was cited Monday at Reagan National Airport for carrying a firearm. We can give him some credit, at least it was unloaded.

According to a Transportation Security Administration official, TSA officers detected the unloaded firearm in the traveler’s carry-on bag as the bag passed through the X-ray machine.  TSA officers contacted the Metropolitan Washington Airports Authority police who confiscated the firearm and cited the man on a state weapons charge.

They did allow the man, who was Houston-bound, to catch his flight. The incident did not have an impact airport operations.

So let’s go over the rules again: you are not allowed to carry weapons — including firearms, parts of firearms and ammunition— in your carry-on bag. You can however,  pack them in your checked bags if they are unloaded, properly packed and you tell the airline you have one (or two).  If you do bring a firearm to an airport checkpoint you could face criminal charges from law enforcement and civil penalties from TSA.

Last week, TSA agents discovered 18 firearms in a single day at checkpoints around the country. That beats the previous record of 13 that was set in 2013. A dubious distinction at best.