What fundamental right may be impacted when detaining a person?

The fundamental right that may be impacted when detaining a person is the right to move freely. Detention inherently involves restricting an individual's freedom of movement, whether for a short period during an investigation or arrest. While other rights might also have implications during law enforcement interactions, such as privacy or speech, the act of detaining someone directly violates their mobility and personal autonomy.

For context, the right to bear arms, while important, does not directly relate to the act of detention itself. The right to free speech may be constrained in specific situations, such as when a person is detained in a manner that limits their communication, but this is not the primary concern during a detention scenario. The right to privacy does play a role in law enforcement procedures, particularly involving searches and seizures, but again, it is not as directly affected by detention as the right to move freely is.