Colorado constitution
Article II
Section 9

Treason against the state can consist only in levying war against it or in adhering to its enemies, giving them aid and comfort; no person can be convicted of treason, unless on the testimony of two witnesses to the same overt act, or on his confession in open court; no person can be attainted of treason or felony by the general assembly; no conviction can work corruption of blood or forfeiture of estate; the estates of such persons as may destroy their own lives shall descend or vest as in cases of natural death.