Self tests can act as private screening tools to give a person an idea whether or not his or her behavior might typically be associated with some sort of alcohol or drug problem. Such tests do not substitute for assessment and evaluation by a certified addictions counselor or addictionologist.
CAGE is an acronym, formed from the words Cut, Annoyed, Guilty, and Eye, as shown below. For drug use screening, substitute the word "drug" for "drink":
MAST is also an acronym, for the Michigan Alcohol Screening Test. For drug use screening, substitute the word "drug" for "drink".
In this MAST test, 1-5 points are assigned for each "yes" or "no" answer, depending on the question.
Once again, tests such as these do not substitute for assessment and evaluation by a certified addictions counselor or addictionologist. They provide an indication of addiction but not a diagnosis.
Many other self tests are available from a number of websites, as well as a large volume of factual information about addiction.