The problem with the ninth and tenth amendment is that the list of state's and individual rights that one can infer could be endless. Neither amendment can be satisfactorily reconciled with the Constitution's Elastic Clause.
Both amendments were included as a sop to those who who believed that any listing of rights would only constrain the federal government's limiting of those rights and to further elaborate on the principle of federalism.
"Generosity. That was my first mistake." "Experience must be our only guide; reason may mislead us." "Instagram is Twitter for people who can't read."
