On September 24th, a federal court in the Northern District of California granted a preliminary injunction requiring the government to stop excluding people who are incarcerated from receiving stimulus payments. The court found that, under the text of the law, people who are incarcerated are not prohibited from receiving CARES Act stimulus payments. While the opinion was limited to individuals who are incarcerated in a criminal setting, there is little to suggest that the reasoning is not applicable to individuals who are being held indefinitely in civil custodial settings, as well.
As the opinion notes, individuals who are eligible have until October 15th to use the non-filer online portal set up by the IRS to claim a stimulus payment.