Here is your Forbes Daily Briefing for Tuesday, September 3rd.

Today on Forbes, meet the Silicon Valley startup

cashing in on school phone bands.

It's post-Labor day and back-to-school season. phone bands.

It's post-Labor day and back-to-school season is in full swing.

Martin Russell, a history teacher at Richardson High School in Texas, is a few weeks into

the school year.

He has taught lessons on the Gilded Age many times before.

But this year, exploring the economics of monopolies and the tales of so-called robber barons

like Rockefeller and Vanderbilt

feels completely different.

That's because eight schools in the district

have now implemented a sweeping new policy

requiring students to lock their phones and pouches from the first bell of the day to the last.

Before class begins at 9 a.m.

2,800 students file into the building with pouches open and phones in hand.

Staff stationed at its five entrances check to see that phones are off

and watch students slide their devices into the pouches,

which were paid for by the district and issued to students on the second day of school.

They then snapped the bags closed, where they're sealed and inaccessible for the rest of the day.

Students keep the pouches in their backpacks until dismissal, when special yonder magnets placed around the exits allow them to unlock the bags and access their phones again.

Russell told Forbes, quote,

...