The unfortunate reality is that having a job as a TSA agent can feel particularly stressful, especially given near-constant interaction with irate or confused travelers. And while no one is expected to be absolutely perfect at their jobs, many would hope the officers tasked with keeping travelers safe on their flights can maintain a keen, watchful eye above all the chaos. Unfortunately, while they've become adept at inspecting passengers and their belongings before they board their flights, they've previously come up short when they themselves have come under scrutiny.

During an internal investigation carried out by the agency in 2015, members of the Department of Homeland Security (DHS) posing as passengers were able to pass potential weapons and fake explosives through checkpoints in 67 out of 70 attempts, ABC News reported. One such test included an undercover agent concealing a fake explosive strapped to his back that was missed even after setting off metal detectors.

Fortunately, DHS was able to provide the TSA with detailed feedback, which the agency said allowed it "to implement a series of actions, several of which are now in place, to address the issues raised in the report," according to a written statement from DHS to ABC News.