The idea of the police using the surveillance state to inform women who are seen with men who have criminal records for violence is just silly.
Violence by A against B, irrespective of sex or the relationship between them, is a serious matter. If the victim wishes, rightly or wrongly, to be reconciled with the attacker then that is a matter for the parties involved. If the victim needs the help of social services or the police, then that help should be readily available.
Any attacker who seriously or repeatedly attacks a victim should be in prison, and required on release with the threat of further imprisonment to keep away from that person.
Jacqui Smith cannot be allowed to avoid the shortcomings of the police and social services by proposing daft measures such as this one.