Which condition must a state meet to be considered a compact state?

For a state to be recognized as a compact state, it must sign the compact agreement. The compact agreement is a formal arrangement between participating states that allows for a streamlined process for licensing and regulation across state lines. This is particularly relevant in areas such as psychology, where professionals may wish to practice in multiple states. By signing the compact, a state agrees to abide by the terms set forth in the agreement, which often includes mutual recognition of licensure and adherence to specific standards of practice that are designed to ensure the quality and safety of services across state boundaries.

The other options do not fulfill the primary requirement needed to achieve compact state status. A specific regulatory body, compliance with federal laws, or a minimum number of licensed psychologists does not directly pertain to the fundamental action of entering into the compact agreement itself. Therefore, signing the compact agreement is the critical step a state must take to become part of this cooperative arrangement.