There have been a lot of questions raised about airport security, but how about this one? A man getting on a plane in los angeles had in his checked bag knives, a club, smoke cuffs and a hat chet. How... See More
There have been a lot of questions raised about airport security, but how about this one? A man getting on a plane in los angeles had in his checked bag knives, a club, smoke cuffs and a hat chet. How did it happen? A b bc news senior correspondent jim avila explains. Reporter: Fireproof leggings, knee pads a chinese knockout bulletproof style vest, all covered by the stair owe tip came long black trench coat. This guy is involved in some sort of delusion or fantasy that's totally didn't appropriate, obviously. Reporter: In fact, sources tell abc news, harris, car rig only a laptop, wore that vest through security in china. But was taken aside and questioned during his route through south korea and japan, then allowed to proceed to the united states. When he landed in los angeles, a customs agent noticed the unusual gash, checked his back and police arrested him. He had a myriad of items in his checked in luggage that raised a lof of suspicion. He had a gas mask, knives, handcuffs. Reporter: Still, it may surprise the average passenger, none of that frightening gear, not even the body bags in his luggage, is banned from planes. Only a smoke grenade, also found in his checked luggage, is illegal, and the tsa is investigating how korean authorities let it get aboard. And while it could have produced plenty of smoke in the cabin, harris had no access to it in the cargo hull. It was not rigged to detonate on its own. Weapons were found, bags left unattended, people go into quarantine areas, things like this happen all the time. Reporter: Police sources say harris told them, "this is a game." And while he was dressed for one, it's clearly not a game homeland security is willing to play. Jim avila, abc news, washington.
This transcript has been automatically generated and may not be 100% accurate.