It seems to me that the correct remedy in this case would be to have a representative of the court preserve specific data requested by the offender, as long as it isn't criminal or harmful, at the offender's expense.
I don't think wiping an offender's phone is justified in most cases even if it might hinder them in potential subsequent crimes, but it does seem justified in this case where the phone contains significant material harmful to the victim of a serious crime.
I don't think wiping an offender's phone is justified in most cases even if it might hinder them in potential subsequent crimes, but it does seem justified in this case where the phone contains significant material harmful to the victim of a serious crime.