LOL ... the sewer system didn’t work, but the security system worked. You can’t make this stuff up, or did they? Unknown in the toilet. Now that is cause enough to throw people off the plane. Most certainly.
Two things.
Number one, maybe they were having a “San Francisco moment” in the lavatory. The military has to take queers now, why not the Air Marshalls, too?
Number two. If they’re going to be setting of alarms because something isn’t “right” in the lavatories, then I better not eat the chili before my flight home next week!