Key legal question
Whether continued enforcement detention was still proportionate while the detainee underwent methadone withdrawal.
Extracted holding
Continued detention could become disproportionate unless the authority actively arranges the withdrawal and addresses medical risks and return conditions.
Extracted reasoning
Because the detainee could not obtain heroin in detention, continued methadone use was not self-evident. The authority had to seek termination of methadone supply, ensure medically indicated treatment in an appropriate facility, and obtain either assurances from the Algerian authorities or a limited methadone-discontinuation arrangement; otherwise continued detention would be disproportionate.