The following defences may be available:
the person had a legitimate reason for having the image in his possession;
the person had not seen the photograph and did not know/suspect the image to be indecent; or
the photograph was received by him, without prior request, and it was not kept in his possession for an unreasonable time.
The person making the image proves that it was necessary to do so for the purposes of the prevention, detection or investigation of crime, or for the purposes of criminal proceedings.