The San Francisco arrested a woman using dna from her rape kit. An informant said it's a common practice in San Francisco and through out the state of California. The DA dropped the charges. Considers it an illegal and unethical practice. Also could dissuade future victims from reporting an assault.
https://wgntv.com/news/san-francisco-police-used-rape-kit-dna-to-arrest-victim-da-says/
https://wgntv.com/news/san-francisco-police-used-rape-kit-dna-to-arrest-victim-da-says/