From PBS NewsHour.

Sunday on PBS News Weekend, Iran warns of retaliation if the U.S. uses force to support anti-government protesters. An investigation raises concerns about quality testing for generic drugs. How social media lures migrants around the world into undertaking treacherous, potentially fatal journeys. Plus, scientists use new technology to track individual monarch butterflies on their migrations.

WATCH TODAY’S SEGMENTS
News Wrap: Iran warns U.S. against supporting protesters

Report raises concerns about generic drug quality testing

How social media lures migrants into treacherous journeys

Scientists use new tech to track monarch butterfly migration

Highlights from PBS News Weekend as show goes off the air

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00:00 – Intro
01:37 – News Wrap
03:23 – Generic Drugs
08:40 – Social Media & Migration
15:14 – Tracking Monarchs
20:07 – Weekend Highlights
25:13 – Farewell