Does the threat of death penalty? History suggests not. So I'd hazard that DNA databases increase the chance of getting caught again (like other technologies such as cell phone tracking, photos, fingerprints, door bell cameras and expert witness) but don't deter or limit recidivism.
This is a question of mens rea, and not about after-the-fact observation.
This is a question of mens rea, and not about after-the-fact observation.