Final answer:
Drugs of abuse can be detected in saliva, hair, urine, and also include breath tests for alcohol and blood tests for metabolites such as acetone. Therefore, the correct answer is "all of these."
Step-by-step explanation:
Drugs of abuse can be detected in various biological samples including saliva, hair, and urine. These samples have specific detection techniques associated with them. For instance, breath test strips are typically used to detect substances like alcohol in a person's system. In the case of urine, test strips with reagents can identify a range of substances. Hair analysis can reveal drug use over a longer period, while saliva tests can provide quick results with relatively non-invasive methods. In terms of blood, detection methods can include the identification of antibodies or certain metabolites like acetone in the case of diabetic patients. Therefore, drugs of abuse can be detected in "all of these" options presented.