In this video excerpt from the LEO Roundtable Podcast, Dr. Travis Yates discusses the constitutionality of police consent decrees.
The 10th Amendment states
The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people
Tenth Amendment is similar to Article II of the Articles of Confederation:
Each state retains its sovereignty, freedom, and independence, and every power, jurisdiction, and right, which is not by this Confederation expressly delegated to the United States, in Congress assemble
Power of Federal Government
The Tenth Amendment, which makes explicit the idea that the powers of the federal government are limited to those powers granted in the Constitution, has been declared to be a truism by the Supreme Court.