The Israeli army arrested Anwar Makhtoob, an 18-year-old Palestinian, over several old Facebook posts two weeks ago. The military prosecutor readily admitted that there wasn't even a suspicion that he had committed a crime, but instead of releasing him, as one might expect, the prosecution and the judge decided to keep him in prison, so that he could be put in administrative detention.
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Administrative detention is a practice Israel uses to hold Palestinians indefinitely without charge or trial on the basis of secret evidence, often in the absence of a crime.
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Administrative detention orders are reviewed every six months, and can be renewed indefinitely. The detainees and their lawyers are usually not told of what crimes they are being accused or shown the evidence against them. The result is that it is virtually impossible to defend oneself against an administrative detention order. Under international law, administrative detention should only be used in the most extreme cases but Israel uses it regularly.
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According to Israeli human rights organization B'Tselem, at the end of October 2018, there were 481 Palestinians — including two women and four minors — in administrative detention.
"If in the past the army would place Palestinians suspected of involvement in violence or armed groups in administrative detention, today the army is jailing completely normative teenagers — who have no political affiliation — without trial on the basis of all kinds of photos and posts on Facebook," Zaher, the lawyer, told +972 Magazine.
https://972mag.com/administrative-detention-israeli-army-palestinian-teen-facebook/139610/
And for those who wonder about the source, here's a story about the organization
https://www.thenation.com/article/israels-new-left-goes-online/