Specifications include, but are not limited to: Services offered at the Mobile Clinic: 1. HIV, Hep C, and other STI/STD testing and treatment referrals 2. Overdose prevention education and supplies (e.g., Naloxone) 3. On-site Certified Peer Support Specialists 4. Referral for SUD treatment including Medication for Opioid Use Disorder (MOUD) 5. Referral to primary care, dental, mental health, and case management services 6. Tools to prevent HIV, STDs, and Hep C (including, but not limited to, counseling and condoms) 7. Each of these services will be available during every consultation with a participant. More or fewer elements of each service may be offered to participants as identified in any evidence-based assessment tool/technique. 8. And other services as agreed upon.