(CNN) -- Colorado theater shooting suspect James Holmes will wear a hidden harness under his clothes to restrain him during his trial, which will have the largest jury pool in state history. Holmes is accused of killing 12 people and wounding dozens more in an Aurora movie theater. He will wear the harness, which will be anchored to the floor, because of the violent nature of his alleged crimes, a judge said. Judge Carlos Samour Jr. will send out 5,000 jury summons and expects at least 3,200 people will end up in court, he ruled on Thursday. That would mean each of the 450,000 Arapahoe County residents eligible for jury duty would have a 1 in 90 chance of being called, for this one case alone, court spokesman Rob McCallum told CNN.
@highlight
NEW: Judge: The jury won't be sequestered, can use phones and laptops outside court
@highlight
NEW: James Holmes will wear a harness that the jury can't see, the judge says
@highlight
The trial of the man accused of killing 12 in a Colorado movie theater should start in February
@highlight
The jury pool will have 5,000 people -- 1 of 90 residents in county -- spokesman says
Making it so they couldn't go home throughout the prolonged trial, @placeholder said, was an "unnecessarily drastic, expensive and impractical remedy that ... will create an extreme and undue hardship for jurors."