Preliminary hearing Determines probable cause to detain. If arrest pursuant to warrant or grand jury indictment, probable cause already established, so no need for hearing. Bail Not constitutionally required, but most states have it. Purpose is to ensure D will appear at trial. Denial of bail when right exists may be a violation of due process.
Preventive detention is consitutional.
Grand jury 5 th Amendment right to grand jury not applied to states. Some states use grand juries anyhow. Grand juries are secret, and D has no right to notice or to call witnesses. No right to counsel. No right to have illegally obtained evidence excluded.