Box Seats at the Security Theater

I'm at the airport and I accidentally walked through the pre-screened security line. The guy checking boarding passes just sent me through without even mentioning my mistake, much less stopping me. Either he truly doesn't give a shit or pre-screening is now on the honor system. I didn't even realize I was in the wrong line until I noticed there was no body scanner in my line.

This is scary. I mean, what if I'd been carrying four ounces of water with malicious intent?