1. Upon a plea of guilty or nolo contendere, or stipulation by the defendant, or a verdict, but before a judgment of guilt is entered, without entering a judgment of guilt and with the consent of the defendant, defer further proceedings upon the condition that the defendant enroll in, attend and successfully complete, at his or her own expense, an alcohol and drug substance abuse course or an alcohol and drug substance abuse treatment program, or both as identified by an assessment conducted by a certified assessor; or

2. Upon a conviction, suspend the execution of sentence, with or without probation, upon the condition that the defendant enroll in, attend and successfully complete an alcohol and drug substance abuse course or an alcohol and drug substance abuse treatment program as provided by Section 3-453 of this title.