The Narcotic Addict Rehabilitation Act, B.E.2545 is aimed at reducing the numbers of drug addicts by means of treatment and rehabilitation. It has provided the executive branch, namely public prosecutors and the subcommittee on the narcotic addict rehabilitation, the power to refer drug addicts to treatment, without the judicial review. Although the measures under this Act is concurrent with the state policy in reducing the numbers of drug addicts, this thesis explored and found flaws in the enforcement of this act, both legal and practical aspects. This Act also fails to protect rights and liberty of the people at certain level. Thus, this thesis suggests the amendment and improvement to fill those unclear provisions to make the Narcotic Addict Rehabilitation Act, B.E.2545 best serve the state’s the policy goals.