prohibited item; banned substance
Refers to any object or substance that is officially forbidden, such as contraband, illegal drugs, or items not allowed in a specific area.
空港で禁止物を持っていると没収される。
If you carry prohibited items at the airport, they will be confiscated.
この競技では禁止物の使用が厳しくチェックされる。
In this sport, the use of banned substances is strictly checked.
Compound of 禁止 (kinshi, 'prohibition') + 物 (butsu, 'thing').