Canada's dangerous offender laws have their roots in the Habitual Offender Act, which dealt solely with offenders with lengthy criminal records, and the Criminal Sexual Psychopath Act. In , the designation "dangerous offender" replaced both "habitual offender" and "dangerous sexual offender. Putting the onus on the offender rather than on the Crown makes it easier to designate some repeat offenders as dangerous offenders, which effectively can put them behind bars for life. Dangerous offenders can apply for parole after seven years, but the indeterminate sentence usually equals a life sentence. Recently, Crown prosecutors have unsuccessfully sought the dangerous offender designation for serial drunk drivers.