That sounds horrible, really horrible. We need better laws for our DNA.
You shouldn't have had social pressure to contribute, police shouldn't be able to broadly harvest data to find an answer like this.
You weren't even given the satisfaction of having your information protected and destroyed afterwards, and a copy is a copy, so even if the data is destroyed - your markers will always identify you, forever.
I was being told my data would be stored securely and deleted when the case was closed. The investigation is closed, but because both the prosecutor and culprit/perpetrator are going to a higher court, I am not sure its already destroyed. Given the nature of my profession I don't feel like I need to fear about my DNA, but I understand YMMV.
You shouldn't have had social pressure to contribute, police shouldn't be able to broadly harvest data to find an answer like this.
You weren't even given the satisfaction of having your information protected and destroyed afterwards, and a copy is a copy, so even if the data is destroyed - your markers will always identify you, forever.