The Secretary of State shall issue codes of practice in connection with—
(a)the exercise by police officers of statutory powers—
(i)to search a person without first arresting him; or
(ii)to search a vehicle without making an arrest;
(b)the detention, treatment, questioning and identification of persons by police officers;
(c)searches of premises by police officers; and
(d)the seizure of property found by police officers on persons or premises.