(a) A lawyer who is participating or has participated in the investigation or litigation of a matter shall not make an extrajudicial statement that the lawyer knows or reasonably should know will be disseminated by means of public communication and will have a substantial likelihood of materially prejudicing an adjudicative proceeding in the matter.

(b) Notwithstanding paragraph (a), a lawyer may state:

(1) the claim, offense or defense involved and, except when prohibited by law, the identity of the persons involved;

(2) information contained in a public record;

(3) that an investigation of a matter is in progress;

(4) the scheduling or result of any step in litigation;

(5) a request for assistance in obtaining evidence and information necessary thereto;

(6) a warning of danger concerning the behavior of a person involved, when there is reason to believe that there exists the likelihood of substantial harm to an individual or to the public interest; and

(7) in a criminal case, in addition to subparagraphs (1) through (6):