Subject to subsection (4) below, anything which has been seized by a constable or taken away by a constable following a requirement made by virtue of section 19 or 20 above may be retained so long as is necessary in all the circumstances.
Without prejudice to the generality of subsection (1) above—
Nothing seized on the ground that it may be used—
may be retained when the person from whom it was seized is no longer in police detention or the custody of a court or is in the custody of a court but has been released on bail.
Nothing may be retained for either of the purposes mentioned in subsection (2)(a) above if a photograph or copy would be sufficient for that purpose.
Nothing in this section affects any power of a court to make an order under section 1 of the Police (Property) Act 1897.
This section also applies to anything retained by the police under section 28H(5) of the Immigration Act 1971.
The reference in subsection (1) to anything seized by a constable includes anything seized by a person authorised under section 16(2) to accompany a constable executing a warrant.