Once a person has been charged with committing an offence (or otherwise authorised by a Magistrate), the police have powers to take photographs, prints, voice recordings or hand samples where it may establish the identity of the person, or establish the identity of the person who committed the offence [see Summary Offences Act 1953 (SA) ss 81(4) and 81(4a); and ss 4b-4d for authorisation by Magistrate when person not charged with the offence]. It is an offence to refuse to provide handwriting or voice samples [see s 81(4e)].