Selecting a jury in an American courtroom can consume more time than presenting the evidence. The delay comes from a screening process that has to be done individually and on the record.
The pool arrives unfiltered
Summonses go out from voter rolls, driver records and similar lists. The people who appear are a cross-section, which is the constitutional point and also the source of the workload.
Nobody has assessed whether they can serve. Employment, caregiving, medical conditions, and language ability are all unknown until the courtroom asks.
Response rates are imperfect, so courts summon far more people than they need. Managing that surplus consumes the first portion of the day before questioning begins.
Hardship is resolved before anything else
A judge must first excuse those for whom service would be a genuine burden, which for a long trial can be a substantial fraction of the room.
These decisions are individual. A hourly worker without paid leave, a sole caregiver, and a small business owner each present different facts requiring separate rulings.
Every excusal shrinks the pool and may require calling additional panels, which restarts the sequence with a fresh group of people who know nothing yet.
Questioning probes for bias one person at a time
The examination known as voir dire asks jurors about experiences, opinions and connections that might prevent them from deciding on the evidence alone.
Some answers must be taken privately at the bench, because a candid response about a crime or a prejudice would contaminate everyone else listening.
In a high-profile case the process expands further, with written questionnaires circulated in advance and each juror examined separately about media exposure.
Two kinds of removal operate differently
A challenge for cause argues that a specific juror cannot be impartial. There is no limit on these, but each must be argued and ruled upon.
A peremptory challenge removes a juror without stated reason, and each side receives a limited number set by rule and by the seriousness of the charge.
Peremptories cannot be used to strike jurors on the basis of race or sex. A challenge to their use triggers a further hearing that pauses selection entirely.
Alternates extend the whole sequence
Long trials seat alternates who hear everything and step in if a juror falls ill or is excused. Each alternate must be selected the same way as a regular juror.
That means the process does not end at twelve. A lengthy case may require several more people cleared through the identical questioning and challenges.
Courts have experimented with staggered reporting times and online prescreening to compress the day, though the individualized questioning at the center remains difficult to shorten.