The value of accurately knowing the absolute calibration of the polarizing elements in the Near Infrared Camera and Multi-Object Spectrometer ( NICMOS ) becomes especially important when conducting studies which require measuring degrees of polarization of close to 1 % in the near infrared .
We present a comprehensive study of all previously observed polarimetric standards using the NIC2 camera on NICMOS .
Considering both pre- and post-NICMOS Cooling System observations we find variations in the polarimetry consistent with the effects of sub-pixel mis-alignments and the point spread function .
We also measure non-zero results from unpolarized standards indicating an instrumental polarization of p \approx 1.2 \%, \theta \approx 88 \arcdeg .
The lack of polarized and unpolarized standard stars with which to perform a comprehensive calibration study means we can not be confident that the current calibration will be effective for a number of recent large NICMOS GO programs .
Further observations of polarimetric standards are needed in order to fully characterize the behavior of NICMOS at around p = 1 \% .