The national DNA Database System, maintained and operated by Forensic Science Ireland, has already proved to be an effective intelligence tool in its first 3 years in existence. The database facilitates the matching of DNA profiles from crime scenes (known as crime stains) with DNA profiles uploaded from individuals under criminal investigation, convicted criminals and former offenders, with a view to solving these crimes and securing convictions. As of the beginning of November this year, the database contained 16,361 DNA profiles of suspected offenders and convicted offenders, along with 4,971 crime stain profiles. There have been some 1,825 person-to-stain matches to date, with a crime stain match effective rate of 36.7%, which compares well internationally. The crime stain match effective rate measures the crime solving capacity, which means that 37 out of every 100 crime stains uploaded onto the database are linked to a person.