> Interview cheating has always been there, but it is generally so rare that it isn't a real concern.

You're the person they're trying to fool, so if they cheat successfully you would never know. You've never seen overt displays of bad cheating, which is different.

Think you haven't seen a stick insect in years? Likely you have, but just didn't notice it...

Cheaters will always be more motivated than those trying to detect them - because everything is on the line for them.