Originally Posted by InkUnderNails

I have watched this intently since I use my NEXUS card, and the process is one that interests me.

Many of the scribbles are simply checking off that the info on the boarding pass matches the same info on the ID.

The odd one is the one that I think may identify the TDC that did the check. It is nearly always the last one done as if to say, "I checked all this stuff and here are my scribbled initials."

That is just my guess.

As for the NEXUS, no challenges in months. It's getting a bit boring at the TDC. Good.