B. Any health regulatory board may restrict the license, certificate, registration, permit, or multistate licensure privilege of any person holding a license, certificate, registration, permit, or licensure privilege issued by it without proceeding simultaneously with notification of an informal conference pursuant to §§ 2.2-4019 and 54.1-2400, if the relevant board finds that there is a substantial danger to the public health or safety that warrants this action. A board may meet by telephone conference call when summarily restricting a license, certificate, registration, permit, or licensure privilege if a good faith effort to assemble a quorum of the board has failed and, in the judgment of a majority of the members of the board, the continued practice by the individual constitutes a substantial danger to the public health or safety. The informal conference shall be scheduled within a reasonable time of the date of the summary restriction. Evidence establishing that the registration issued by the U.S. Drug Enforcement Administration to a person holding a license, certificate, registration, permit, or multistate licensure privilege has been suspended or voluntarily surrendered in lieu of disciplinary action is sufficient for a finding that there is a substantial danger to the public health or safety.