While I am not familiar with the Tacoma Detention Center, detained and non-detained unaccompanied minors may be eligible to self-petition for permanent residence through the Special Immigrant Juvenile (SIJ) visa. You may want to call your local immigration pro-bono services in the area as there may be some pro bono services for detained juveniles eligible for SIJ. Unaccompanied minors are a huge issue and their care in detention can vary depending on what part of the country the child is detained. You can always contact your local and federal representatives if you are concerned about how these children are being cared for in custody. You may also want to contact an immigration attorney in your vicinity who is a member of the American Immigration Lawyers Association (AILA) and ask them for further advice on how to get involved in helping these individuals at a local level.