Volunteering and moonlighting refer to activities outside the scope of the foreign national's employment authorization. Participating in these kinds of activities may violate the individual's visa status. The U.S. Citizenship and Immigration Services (USCIS) provides the following guidance regarding authorized work, volunteering, and moonlighting.
Volunteering may be allowed if the individual does not expect compensation, reward, or future benefit. Many community-based and student based organizations offer opportunities for volunteering. As long as no compensation is involved, and the opportunity is officially advertised as a volunteer position, the foreign national may participate.
If the individual expects compensation, reward, or future benefit, then the volunteer worker probably violates their visa status and is not authorized. This includes the following situations:
Moonlighting is defined as any professional medical activity outside the usual training experience and includes both compensated and uncompensated (e.g., voluntary) activities. Many visa types are employer-specific, such as H-1B, TN, O-1, & J-1. Business activities are strictly enforced for all nonimmigrant workers and activities at other businesses or organizations must meet USCIS and the U.S. Department of Labor regulations. J-1 Exchange Visitors are prohibited from external moonlighting.
Supplemental Clinical Activity for J-1 Physicians (a.k.a. Internal Moonlighting)
J-1 physicians may be authorized to engage in “supplemental clinical activities” within their training institutions, provided certain conditions are met: