戴返頭盔先,呢樣唔太熟,有法律巴或者衞生署巴打解答最好
不過岩岩翻查Cap.138第22(4)就淨係寫「Any authorized seller of poisons who fails to comply with this section shall be guilty of an offence and shall be liable on conviction to a fine at level 2.」呢條淨係講咗藥房老板會比人罰款,冇提到買嘅人
不過138入邊23條寫「No person shall have in his possession any poison included in Part 1 of the Poisons List otherwise than in accordance with the provisions of this Ordinance, the proof whereof shall lie upon him.」我嘅理解係要依合法途徑拎到第一部毒藥先可以合法管有,如果佢非法賣比你,你買咗袋係身,你理論上應該都係犯法
唯一方法係你證明到佢肯賣比你,但你又冇真係買到袋係身,咁就應該得佢犯法你無事,但可能直接報衞生署仲實際啲