probable, therefore, with respect to mail than to media advertising (see Ohralik, 436 US 447, 466-467, supra; Allison v Louisiana State Bar Assn., 362 So 2d 489, 496 [La]).
That there is a substantial State interest to which the regulations are closely related does not end the inquiry, however, for complete suppression is not constitutional if the State’s interest can be adequately protected by more limited regulation. That it can be seems hardly open to question, in view, for example, of the filing requirement for retainer statements now contained in the Appellate Division’s rule 691.20 (22 NYCRR 691.20). That similar filing of a solicitation letter assures the public ample protection was the conclusion of the Supreme Court of Kentucky (Kentucky Bar Assn. v Stuart, 568 SW2d 933, 934 [Ky], supra).6
Our discussion so far assumes that the ban against solicitation is a restriction as to content or subject matter, rather than manner of communication. The Supreme Court has, however, differentiated between the two applying the criteria discussed above to content restriction but upholding a regulation of time, place or manner if reasonable, if it serves a significant governmental interest and if it leaves ample alternative channels for communication (Consolidated Edison v Public Serv. Comm., 447 US 530, 535-536, supra; Virginia Pharmacy Bd. v Virginia Consumer Council, 425 US 748, 771, supra).
Since that categorization gives rise to some problems in analysis (cf. Reich, Preventing Deception In Commercial Speech, 54 NYU LR 775), we note that the result would not differ were we to apply the manner rather than the content criteria. The Committee argues that "ample alternative channels” are left open because nothing in the letter, with the exception of the personal references, was unsuited to communication in a newspaper, magazine, advertising supplement, telephone directory, radio or television advertisement. There is, however, nothing to show what the comparative costs of the suggested alternatives is or whether the more direct and discursive letter form is not more effective, and thus no basis for concluding that the alternatives are "ample”. There is, moreover, respondent Koffler’s testimony that at least the newspaper advertising which they tried first was ineffectual,
6
Our discussion of a filing requirement is, of course, by way of example only and not by way of prescription.