How does the proviso to this clause relate to the maximum period of detention?
The proviso to this clause relates to the maximum period of detention by stating that it shall not authorize the detention of any person beyond the maximum period prescribed by any law made by Parliament under sub-clause (b) of clause (7). This means that even if an Advisory Board recommends further detention, the person cannot be held in detention for a longer period than what is legally allowed according to the law made by Parliament.