The independent agency established to root out corruption in the government said the measure, which bars him from meeting with his family members including First Lady Kim Keon Hee and other visitors, was put in place due to concerns over possible evidence tampering or giving false testimony in collusion with those involved in the debacle.
The CIO cited that Yoon had changed his phone and terminated his account with the messaging service Telegram as possible attempts to destroy evidence.
But Yoon's lawyers complained about the measure, calling it "inappropriate."
"Even though his duties are suspended, the president must stay informed about ongoing domestic affairs and other matters at all times in preparation for his return to power," Seok Dong-hyun, one of his lawyers, wrote on Facebook, suggesting that the president needs to get briefed by key presidential officials and others.
Investigators from the CIO are also considering an on-site investigation at a remand prison in Uiwang, Gyeonggi Province, as Yoon has been stalling with questioning despite repeated requests.
The CIO, which is not entitled to prosecute a suspect must refer the case to prosecutors, is expected to wrap up its investigation by early next month, before Yoon's detention period, which can be extended up to 20 days, ends.
Meanwhile, Yoon's legal team may consider filing an injunction to appeal the legality of his detention.
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