So no I do not think it is "slippery slope" at all, we have already slide down the slope; arriving at the bottom. We long ago surpassed the level of government surveillance I believe is ethical, constitutional, or proper for government
if the government having a database filled with everyone Bio metric data they can then use technology to follow, trace, and monitory your every movement is not a "surveillance state" I shutter to think what it would take for you to classify such as system? a Brian implant that reads your every thought?