Witness’s use of addictive drugs is the use of drugs by a witness in a legal proceeding, usually during cross-examination. Types of drugs used include alcohol, opioids, stimulants, depressants, hallucinogens, and other substances. These drugs can be used to alter a witness’s state of mind, making them more suggestible or more likely to provide false or misleading information. Witness’s use of addictive drugs can be used to influence their testimony, potentially leading to a miscarriage of justice. Witness’s use of addictive drugs can also be linked to diminished cognitive functioning, impaired decision-making, and a lack of recall of events.