What characterizes an individual as drug dependent?

An individual is characterized as drug dependent when they suffer from drug dependence, which is defined by a compulsion to use the drug, experiencing withdrawal symptoms, and showing a diminished control over use despite negative consequences. This condition typically includes psychological and physical aspects, where the individual may feel unable to function without the substance, leading to a cycle of use that can escalate over time. Drug dependence encompasses both the tolerance developed to the drug and the physical or psychological reliance on it, making this definition the most comprehensive and accurate relating to the characteristics of drug dependency.

Other options describe aspects or potential consequences of drug use rather than defining dependence. Occasional use does not equate to reliance; having a high tolerance might be a sign of dependence but does not alone characterize it; and having a criminal record, while often associated with substance abuse issues, does not indicate whether an individual is dependent on drugs. Thus, suffering from drug dependence is the key factor that identifies an individual as drug dependent.