What is the definition of prohibited?

Something that has been forbidden; banned.

To formerly forbid (something) law, rule or other authority.

Explanation:

e. gall ivory trafficking between countries is prohibited. Synonyms.

prevent, stop etc.

Antonyms.

allow, facilitate etc.

not permitted : forbidden by authority

Explanation:

for example

The police can arrest anybody found in the vicinity of prohibited drugs, whether he's an innocent visitor or the real culprit.