Looking a Gift Horse in the Mouth: Federal Agency Opposition to State Institutional Control Laws -- Introduction -- Institutional Controls: What They Are and How They Work -- Summary of Colorado's SB 145, the Environmental Covenant Law -- The Statute Is Consistent With RCRA's Waiver of Immunity -- The Property Clauses of the U.S. Constitution Do Not Preempt SB 145 -- The Property Act Does Not Impair Federal Agencies' Ability or Obligation to Comply -- CERCLA 120(h) Does Not Preempt State Institutional Control Laws -- Conclusion.