What is the test for compliance with the notice of purpose requirement?

62 Compliance with the notice of purpose requirement envisions the government agents stating a lawful reason for entry: Eccles v. Bourque et al., supra at 134. In the modern era, this requires something more than the traditional “Open in the name of the King”. In Re Curtis (1756), 168 E.R. 67 nine of the eleven judges stated at 68: It is sufficient that the party hath notice, that the officer cometh not as a mere trespasser, but claiming to act under a proper authority: and if, after this notice, he be resisted, and he or any of his assistants killed in consequence of such resistance, it will be murder; provided it cometh out in evidence that the officer had a legal warrant. The person making such resistance, after such notice, doth it at his own peril. (emphasis added)