Well, he was wrong (as Judges frequently are). Or at least, he would be wrong here in Minnesota. California might be different.
Having previously worked at county data processing on the computer systems that do jury selection & summonsing, I know something about the procedure.
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[li]We use voter registration lists, drivers license lists, and state Id (non-driver) lists as sources to select jurors. They were considering adding income tax & property tax returns to expand the pool; I don’t know if that was implemented.[/li][li]The lists are match-merged, so if you are both a registered voter & licensed to drive, you are NOT twice as likely to be chosen. (But that might not work, if your name is different on those lists.)[/li][li]The merged list is purged, removing people who have been convicted of a felony within the past 10(?) years, or who are still on parole/probation. Also removed are people who have actually shown up for jury duty within the past 3(?) years – just showing up gets you off the list for 3 years, even if you are never actually selected to serve on a jury. We also had lists of professions that we eliminated, because they were almost always challenged and didn’t end up serving on a jury. Examples were lawyers, elected officials, clergy, etc.[/li][li]The selections are random, from that merged list. So the chance of being selected is the same whether you came from the voter list, drivers license list, etc.[/li][li]While the selection is random, we had some overall checks to ensure that random chance didn’t leave us with get a jury pool too similar. For example, by age (under-30, 30-65, 65+), or by home location (urban, suburban, rural) – we didn’t want more than 2/3rds of the selected juror pool from just one of those groups. Same for male-female – we didn’t want a pool with more than 2/3rds the same gender. If it was, we held some of those for next week’s selection, and had the computer randomly select some more.[/li]
Note that this was just our pool of summonsed jurors. The ending pool was often skewed because of excused jurors; for example, young people were often excused because of college classes, middle-aged people excused because of work hardship, thus leaving a higher proportion of older, retired people in the jury pool.
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About the seriousness of not showing up when summonsed – that depends on the county Court. Ours took it quite seriously.
The people in the jury office were both reasonable, and quite persistent. So, for example, if you called them and said “I got this summons, but I’m a student taking classes – I need to be excused” they would respond “Oh sure, we can reschedule that – when is spring break at your school?”. Quite reasonable about postponing it to meet your schedule, but very persistent that you must eventually report for jury duty. Same with claiming that you were too busy at work – they would just ask when would there be a slow time at work, we can reschedule you for then.
As for just not showing up, they would recall you for the next week, and the week after that, with increasingly more emphatic letters. They would not actually send a deputy out to arrest you, but their policy was on the 3rd strike (3rd time not showing up when summonsed – 2nd time if they had rescheduled it for you) they would have the court issue an arrest warrant for you. The sheriff’s department seldom ever had time to actually serve those, but it went onto your record. So if you were ever pulled over for a traffic stop, went to renew your drivers license, to replace your license plates, get a copy of your birth certificate or other government document, etc., this would pop up, and you would be hauled off to jail. As they said, eventually we will get their attention.