Effective Date 
Section effective Nov. 1, 1987, and applicable only to offenses committed after the taking effect of this section, see section 235(a)(1) of Pub. L. 98–473, set out as a note under section 3551 of this title.
(1) has not, prior to the commission of such offense, been convicted of violating a Federal or State law relating to controlled substances; and
(2) has not previously been the subject of a disposition under this subsection;
 
 Effective Date 
Section effective Nov. 1, 1987, and applicable only to offenses committed after the taking effect of this section, see section 235(a)(1) of Pub. L. 98–473, set out as a note under section 3551 of this title.