I just started a job I would like to keep, so I'm just wondering if polygraphs are required to keep the SCI access.
If you were not required to submit to a polygraph interrogation before SCI access was granted, then I think it is unlikely that you would be subject to periodic or aperiodic polygraph screening. However, you may be required to submit to a polygraph séance if you are "read on" to a Special Access Program.