The 8A has a fairly clearly statement of ostensible "prohibition" upon such things as bail: Amendment 8 - Cruel and Unusual Punishment. Ratified 12/15/1791. Excessive bail shall not be required, nor excessive fines imposed, nor cruel and unusual punishments inflicted. Of course, the courts have long since ceased caring much about that, in example after example. "Shall not be required," which is taken with as much seriousness by the courts as is "Shall not be infringed." Which is to say: it isn't taken seriously, as a prohibition. If anything, "excessive" is whatever a judge wants it to be.