... We developed a methodology to quantify and remove the induced polarization as detected by the FOS spectropolarimeter (Allen 1995), and modified the FOS calibration pipeline to accommodate post-COSTAR FOS Blue spectropolarimetry observations. ... The post-COSTAR polarization correction has been implemented for FOS Blue spectropolarimetry data in Version 3.0 and higher of both the calibration pipeline, calfos , as well as in the stand-alone polarimetry processing task, calpolar . ...