Hmmmmm... then someone in TSA "management" should check DEN's checkpoints. No scribbles, etc. there; TDCs just stamp the BP with a round "stamper" that has a "print" radius of about 1/2 inch. Wonder how they audit that the TDC was doing the right things?
My last time through SAT, the TDC had a round stamp divided into four quadrants for name, date, time, and terminal.
One time through BUR I "pre-scribbled" my boarding pass by making checkmarks next to name and flight info, and then drew a doodle on the boarding pass. The TDC called over the TDC next to her to try and figure out why my boarding pass looked like that.