PART 4 - ARREST AND SURRENDER OF PERSON TO ICC
Miscellaneous provisions relating to arrest and surrender
77.
Search and seizure on arrest—
(1)If a person is arrested on a warrant issued under this Part, a member of the police may search, without further warrant, the person arrested and may seize any thing, including any sum of money, found on the person or in the person's possession if the member of the police believes on reasonable grounds that the thing on the person or in the person's possession may be evidence as to the commission of any offence in relation to which the warrant to arrest was issued or for which the surrender of the person is sought by the ICC.
Search and seizure - national procedures for ICC proceedings
EDIT.