Congressional Pre-emption of State Laws
The Congressional Pre-emption of State Laws has been documented in a report released in June 2006 by Henry A. Waxman. The report states that the U.S. House of Representatives and the U.S. Senate "had voted 57 times in the previous five years to preempt state laws and regulations." 
- Henry A. Waxman, "Congress Has Voted More Than 50 Times to Override State Laws", Media Release, June 6, 2006.
- Representative Henray A. Waxman, "Database of Congressional Preemption of State Laws and Regulations", June 2006.
- Henry A. Waxman, "Congressional Preemption of State Laws and Regulations", June 2006. (Pdf)
- Preemption (law) in the Wikipedia.
- Supremecy Clause in Answers.com.
- "The Supremacy Clause and Federal Preemption. The issue: How should courts determine whether a federal law preempts state law?" University of Missouri-Kansas City School of Law, undated.
- "Preemptions in Federal Legislation in the 106th Congress," Congressional Budget Office, June 2001.
- "States Losing Ability to Protect Public Due to Federal Preemptions," OMB Watch, June 13, 2006.
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