What does the bolded sentences mean?

Your DNA sample will be destroyed within six months of it being taken, following a satisfactory profile being derived from it and your fingerprints, DNA sample and DNA profile and all copies and records will be destroyed immediately if you are not appointed, or when you leave the police service. This is subject to the retention of hard copies with case papers until the conclusion of any outstanding case or impending trial where the fingerprints may be subject to disclosure.