Answer
Yes. Some screening tests may give false-positive results for methadone, opiates or PCP; a more specific confirmatory test can be used.
Sources for this answer
- Xonvea 10 mg/10 mg gastro-resistant tablets — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.