The power of the state to detain persons prior to trial was extended by the Sixteenth Amendment, in 1996. In 1965, the Supreme Court ruled in the "O'Callaghan" case that the constitution required that an individual charged with a crime could be refused bail only if she was likely to flee or to interfere with witnesses or evidence. Since the Sixteenth Amendment, it has been possible for a court to take into account whether a person has committed serious crimes while on bail in the past.