(a) Unless otherwise provided by law, where sources of supply have been established by contract and certified by the Secretary of Administration to the said departments, institutions and agencies as herein provided for, it shall be the duty of all departments, institutions and agencies to make requisition or issue orders on forms to be prescribed by the Secretary of Administration, for purchases required by them upon the sources of supply so certified, and, except as herein otherwise provided for, it shall be unlawful for them, or any of them, to purchase  from other sources than those certified by the Secretary of Administration. One copy of such requisition or order shall be furnished to and when requested by the Secretary of Administration.

(b) Expired.  (1931, c. 261, s. 6; 1957, c. 269, s. 3; 1971, c. 587, s. 1; 1975, c. 879, s. 46; 2006-264, s. 59(c); 2009-475, s. 7; 2011-338, s. 5.)