Paraphernalia and Drug Testing: Clinical, Legal, and Practical Considerations in Substance Use Treatment is a self-paced professional training designed for clinicians who want to better understand how drug paraphernalia and drug testing inform substance use assessment, treatment planning, risk identification, clinical documentation, and ongoing care. Drug paraphernalia and drug testing are often viewed as procedural or secondary issues, but both can provide important clinical insight into patterns of use, routes of administration, severity, risk, and treatment engagement. Paraphernalia may include items used to prepare, consume, store, conceal, or enhance the effects of substances, while drug testing may be used across clinical, medical, legal, workplace, probation, and monitoring settings. Participants will explore how different types of paraphernalia can reflect substance use patterns, progression, medical risk, and behavioral concerns, including smoking, vaping, intranasal use, injection-related supplies, storage items, and concealment methods. The training also reviews major drug testing methods, including urine, saliva, blood, hair, and sweat testing, with attention to detection windows, interpretation limits, false positives, false negatives, confirmatory testing, tampering, and evasion. Clinical implications for assessment, ethical practice, legal considerations, psychoeducation, documentation, and treatment planning are emphasized throughout the course. Participants will consider how paraphernalia and drug testing results can be integrated into a broader clinical picture without relying on them as standalone indicators of honesty, impairment, relapse severity, or treatment progress. Applied case examples support clinical decision-making around adolescent use, minimization, stimulant use, over-the-counter medication misuse, unknown substances, injection-related risk, and maintaining the therapeutic alliance.