I worked for 10 years at Delaware and Washington st. That used to happen all the time. We would NEVER walk on the east side of Delaware for that reason.several years ago there was an indystar story about some court officers being sent out to grab some citizens for a jury. people just walking by, or sitting on a bench eating lunch, whatever. iirc, they asked people if they were U.S. citizens.
the story said they were allowed to do that, in the particular situation.
did a quick internet search of indystar, but did not find the story.