There's probably a heckuva natural experiment enabled by this change. By surveying pot usage and comparing it with earlier responses during lie detector exams,

There's probably a heckuva natural experiment enabled by this change. By surveying pot usage and comparing it with earlier responses during lie detector exams, it may be possible to tease out about how many people were confident they could consistently beat the polygraph (probably because they knew or suspected polygraphs don't work). It could generate more data to finally help prove that polygraphs, which largely rely on subjects believing they work, are pointless because so many people already know they don't.