This is in LAX Terminal 8 flying to SJC on SkyWest/UEX

Had SSSS (domestic leg of travel back from S.America) so went through the drill. Only after I was on my way to the gates I realized that no one bothered about my cap (they did about the shoes of course). No wanding over head, nothing. I usually remove the cap at checkpoints, but this time I just forgot.

So my question is what is your experience with SSSS and wearing cap at checkpoints? Shouldn't TSA be concerned about people wearing caps at checkpoints as technically anything could have been there?

On a related note, why on earth am I getting SSSS consistently of United flights if I take them within US as part of international itenarary? I don't get SSSS on United if travel is within US, but the moment I have international connection I get SSSS (ex: had SSSS for SFO-IAD as part of trip to GRU)

Regards