Are physical restraints for criminals unconstitutional?

The case of the criminal defendent in Georgia who overpowered a deputy and used the deputy's gun to kill several people including a judge should lead us to take another look at rules precluding restraints on defendents. Michelle Malkin has links to several past arguments on the subject. Morons (like the ACLU) have argued that seeing the defendent in shackles could cause the jury to pre-judge the case. Political correctness and excessive concern for criminal rights have hampered law enforement for decades and now have resulted in several deaths.