Cosmetics Good Manufacturing Practice Regulations Article 9

Visitor or untrained personnel shall be prohibited to enter production, control and storage area. However, if there is any necessity to enter these areas, they shall be given related precaution in advance, including rules about personal hygiene and the prescribed protective clothing, and closely supervised.
中文原文 化粧品優良製造準則第9條
化粧品製造業者,對於訪客與未經訓練之人員,應禁止其進入生產、管制及儲存區域。
但確有進入必要者,應事前告知其相關注意事項,包括個人衛生及防護衣物穿戴之規定,並予密切督導。

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