Regulations Governing the Detention of the Aliens Article 4

Except for daily necessities, articles carried by a detainee shall be examined and put in the custody of a detention center. A Personal Property Record shall be made by the duty officer upon receiving such articles. The articles shall be returned when the detainee leaves the detention center. For valuable items, a Valuable Personal Property Record shall be made. When the articles are considered not suitable for custody by the duty officer, the detainee shall be ordered to properly dispose such articles immediately. The above requirements shall also apply to articles mailed to the detainees.To ensure the safety and management of the detention center, the center may inspect the detainee, articles he/she is carrying, or the detention area.
中文原文 外國人收容管理規則第4條
受收容人攜帶之物品應經檢查,除必要之日用品外,應由收容處所代為保管,並製作代保管紀錄,於出所時發還;貴重物品,應製作財物代管發還紀錄表;收容處所認為不適宜保管之物品,應不予保管,並當場請受收容人為適當之處理。
他人寄送予受收容人之物品,亦同。
為確保收容區之安全及管理之必要,收容處所得對受收容人之身體、隨身物品及收容區實施檢查。

English translation for reference only; the Chinese text prevails. Not legal advice.