I don't know why no one thought of this before...
If you're homeless, you have no mailing address at which to get a summons.
If you're homeless, you don't make any money, except what you can beg for at an off-ramp.
I hate jury duty. The pay for the day is less than I charge someone per hour. However, it might be more than most homeless people make.
So why not send the homeless people to jury duty?