Brandon,

I don't know precisely when these antipolygraph laws went into effect, but all were enacted before AntiPolygraph.org went on-line in 2000. These five states get along just fine without pre-employment polygraph screening, and there is no reason the others can't, too. In addition, none of the democracies of Western Europe use pre-employment polygraph screening.

See the text of Minnesota's antipolygraph statute included in The Lie Behind the Lie Detector. It provides a good model for other states to follow.