Section 17-607. Post-accident testing

a. A drug test must be administered to
  any  bus  driver who, during the course of his or her employment, (i) is
  involved in a serious accident while operating  a  bus  or  other  motor
  vehicle; or (ii) during any twelve month period, is involved in three or
  more  accidents while operating a bus or other motor vehicle, regardless
  of the amount of property damage caused or injuries sustained.
    b. The specimen for a post-accident drug test required by this section
  shall be collected as soon after the accident as is practicable, but not
  later than thirty-two hours after the accident. In those cases involving
  testing under paragraph (ii) of  subdivision  a  of  this  section,  the
  specimen  shall be collected in accordance with the requirements of this
  subdivision after the third accident.