"GDPR, in contrast, explicitly recognizes the sensitive nature of genetic data collected in a variety of settings. In Article 9, an adjusted definition of special categories of personal data has been provided that includes genetic data and biometric data, among others." [1]
This is not new -- I believe there have been at least a couple of arrests made as the result of a suspect's relatives contributing DNA in lieu of actually obtaining one from the suspect directly -- and provided there's consent from the relatives, I can't see much grounds from restraining someone from allowing their own DNA to be used to build a case against someone else. It becomes a bit murkier if you start compelling people to contribute DNA to build a case against a family member, but even there I can see parallels to other types of evidence and it's not a clear slam-dunk to me that it ought to be barred unless the familial relationship is one where testimony would normally be covered by marital confidence or other privilege.
So caveat emptor as always...but yep I had just wondered in general about "right to delete" with respect to genomic data.
And the definition of personal data extends to any data that can be linked to you. For example, if a server records a log entry with your name and IP, and the server also records log entries with just the IP, all of the log entries are considered personal data, even for dynamic IPs in some instances[3].
There are some exceptions around criminal justice and the protection of persons and property, however, I still wouldn't be surprised if this DNA evidence were ruled inadmissible in the EU.
[1] Court of Justice of the European Union [2] http://curia.europa.eu/juris/document/document.jsf?docid=160... [3] https://www.whitecase.com/publications/alert/court-confirms-...
It sure would seem awful suspicious if someone requested DNA deletion out of the blue. Not convictably-suspicious, but suspicious enough to warrant followup investigation. ;)