I don't see how drug testing citizens with no probable cause is NOT an invasion of privacy.
And I can honestly say I have never heard of getting high of bath salts.
http://www.cnn.com/2011/POLITICS/06/01/florida.welfare.drug.testing/index.html
This is my favorite part of the article:
Controversy over the measure was heightened by Scott's past association with a company he co-founded that operates walk-in urgent care clinics in Florida and counts drug screening among the services it provides.
In April, Scott, who had transferred his ownership interest in Solantic Corp. to a trust in his wife's name, said the company would not contract for state business, according to local media reports. He subsequently sold his majority stake in the company, local media reported.