A more thorough explanation:

SUBSTANCE-ABUSE EVALUATION AND TREATMENT

Substance-abuse evaluation and treatment is a court-ordered program for drug offenders to participate in a drug rehabilitation program. This type of treatment is commonly used in cases of driving under the influence (DUI). It is abbreviated as SAET.

• A person convicted of a DUI may be ordered to participate in a SAET program to address their substance abuse issues.
• John was caught with illegal drugs and was given the option to participate in a SAET program instead of going to jail.

These examples illustrate how substance-abuse evaluation and treatment is used as a form of rehabilitation for drug offenders. It is a way for them to address their substance abuse issues and hopefully prevent future offenses. The program is court-ordered, meaning that it is mandatory for the offender to participate. SAET is commonly used in cases of DUI, as driving under the influence is a serious offense that can result in harm to oneself and others.