Yes.
It’s not a constitutional command, but a judicially crafted prophylactic rule (Davis v. United States , 512 U. S. 452 (1994)). Nor did Scalia create the original rule’s frame; that came from Miranda and Edwards. Stare decisis mandates his continuing with an approach that would not have been created in the first place using his method – that is, he didn’t create Miranda or Edwards, but must fashion current decisions consistent with their commands. Since Edwards itself is “our rule, not a constitutional command,” it falls to the judiciary to further refine it as necessary. Lower courts had uniformly held that the Edwards wall is vitiated by some waiting period, and it thus fell to the Supreme Court to uniformly define that period.