I would assume TSA (Transportation Security Administration) security to be especially tight no matter the airport, but it seems that the different airports I have been to have often very different policies.
For example, I went to OAK (Oakland International), but security was very very lax. For example, shoes stayed on the entire time, electronics did not need to be taken out of the backpacks, belts and wallets did not need to come out. No full body scanners were in place, only metal detectors and the usual bag screening.
However, IAD (Washington Dulles) and SFO (San Franciso International) were much more stringent, requiring full body scanners, shoes and metal objects going in containers, etc.
Is there a reason that these security protocols vary so widely in different airports?
To note, I flew domestic on each flight. This "data" was composed out of 3 trips leaving from OAK, then flying back. Security protocols remained the same flying