What is the test for validly waiving the Miranda rights?

The inquiry regarding whether a defendant has validly waived his rights under Miranda, supra, 384 U.S. 436, has two distinct dimensions. (Moran v. Burbine (1986) 475 U.S. 412, 421.) First, the waiver must have been voluntary, which means a free and deliberate choice not based on intimidation, coercion, or deception. Second, the waiver must have been made with a full awareness of the rights being waived and the consequences of the decision to do so. A court may properly conclude Miranda rights were validly waived only if the totality of the circumstances shows both an absence of coercion and the requisite level of comprehension. (Ibid.)