Teachers have flexibility under the deal, which outlines how distance learning will continue for the rest of the school year.
District policy of random searches disrupted instruction and made students feel less safe, principal says.
Show of strength by United Teachers Los Angeles despite efforts to weaken it by depriving it of union fees.
California's largest school district joins the "Red for Ed" movement that until now has mobilized teachers in mostly Republican states.
Teachers' concerns extend beyond bread-and-butter issues, union leaders say.