On the sixth floor of the federal courthouse building in downtown Baltimore, sealed off from the public, there are holding rooms containing little besides a single toilet. Generally, these processing cells accommodate just a few immigrants for up to 12 hours. But in the last few months, Immigration and Customs Enforcement (ICE), which has an office in the building, has been packing them full of people for days at a stretch, lawyers in the area say, seemingly violating the agency’s own rules.

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