Section 19-512.1. Revocation of taxicab licenses

a. The commission may, for
  good cause shown relating to a direct  and  substantial  threat  to  the
  public  health  or  safety and prior to giving notice and an opportunity
  for a hearing, suspend a taxicab  or  for-hire  vehicle  license  issued
  pursuant  to  this  chapter  and,  after notice and an opportunity for a
  hearing, suspend or  revoke  such  license.  The  commission  may  also,
  without  having suspended a taxicab or for-hire vehicle license, issue a
  determination to seek suspension or revocation of such license and after
  notice and an opportunity for a hearing, suspend or revoke such license.
  Notice of such suspension or of a determination  by  the  commission  to
  seek  suspension  or revocation of a taxicab or for-hire vehicle license
  shall be served on the licensee by personal delivery or by certified and
  regular mail within five calendar days of the pre-hearing suspension  or
  of such determination. The licensee shall have an opportunity to request
  a  hearing  before  an administrative tribunal of competent jurisdiction
  within ten calendar days after receipt of any  such  notification.  Upon
  request such hearing shall be scheduled within ten calendar days, unless
  the   commission   or   other   administrative   tribunal  of  competent
  jurisdiction determines that such hearing would  be  prejudicial  to  an
  ongoing  criminal  or  civil  investigation. If the tenth day falls on a
  Saturday, Sunday or holiday,  the  hearing  may  be  held  on  the  next
  business  day.  A  decision  shall  be  made  with  respect  to any such
  proceeding within sixty calendar days after the close of the hearing. In
  the event such decision is not made within that time period, the license
  or medallion which is the subject of the proceeding shall be returned by
  the commission to the licensee and deemed to be in full force and effect
  until such  determination  is  made,  unless  the  commission  or  other
  administrative  tribunal  of  competent jurisdiction determines that the
  issuance of such  determination  would  be  prejudicial  to  an  ongoing
  criminal or civil investigation.
    b.  It  shall be an affirmative defense that the holder of the taxicab
  or for-hire vehicle license or the owner  of  the  taxicab  or  for-hire
  vehicle  has  (1)  exercised due diligence in the inspection, management
  and/or operation of the taxicab or for-hire vehicle and (2) did not know
  or have reason to know of the acts of any other person with  respect  to
  that  taxicab or for-hire vehicle license or taxicab or for-hire vehicle
  upon which a suspension, proposed suspension or proposed  revocation  is
  based.   With respect to any violation arising from taximeter tampering,
  an owner's due diligence shall include, but not  be  limited  to,  those
  actions  set forth in subdivision h of section 19-507.1 of this chapter.
  Any  pre-hearing  suspension  period  shall  be  counted   towards   any
  suspension period made in any final determination.