Title 15, Chapter 12, Section 100
(a) The chief judge of the superior court of any county to which
this part applies, on his own motion or on petition of any elected
public official of the county or of a municipality lying wholly or
partially within the county, may request the judges of the superior
court of the county to impanel a special grand jury for the purpose
of investigating any alleged violation of the laws of this state or
any other matter subject to investigation by grand juries as
provided by law.
(b) The chief judge of the superior court of the county shall submit the question of impaneling a special grand jury to the judges of the superior court of the county and, if a majority of the total number of the judges vote in favor of impaneling a special grand jury, the members of a special grand jury shall be drawn in the manner prescribed by Code Section 15-12-62. Any special grand jury shall consist of not less than 16 nor more than 23 persons. The foreman of any special grand jury shall be selected in the manner prescribed by Code Section 15-12-67.
(c) While conducting any investigation authorized by this part,
investigative grand juries may compel evidence and subpoena
witnesses; may inspect records, documents, correspondence, and books
of any department, agency, board, bureau, commission, institution,
or authority of the state or any of its political subdivisions; and
may require the production of records, documents, correspondence,
and books of any person, firm, or corporation which relate directly
or indirectly to the subject of the investigation being conducted by
the investigative grand jury.