Study findings indicate that the experience of detention, even for a relatively brief period of time, has a detrimental effect on the mental and physical health of children. The children in this assessment appear to be experiencing high levels of depression, anxiety, sleep problems, somatic complaints, emotional symptoms, and behavioral difficulties since being detained. These findings support those of previous reports that detention is not in the best interest of the child and should not be used for the purposes of immigration control. Current British law allows for families with children subject to immigration control to be detained for indefinite periods of time. The United Kingdom Government's practice of detaining children has increased since 2001. The well-being of children held in United Kingdom immigration detention centers has given cause for concern. Using a sample of 24 children detained in British immigration detention centers, this study assessed both the mental and physical health of these children. Tables and references