New documentary explores the Tylenol cyanide murders - and the reason tamper-proof seals are on everything

In 1982, seven people in Chicago died after taking Tylenol laced with lethal cyanide, causing fear and a change in consumer product safety. Two suspects emerged but there were no arrests or answers. Now, a new Netflix docuseries, out May 26, examines the decades-old mystery offering an exclusive interview with one of the prime suspects, writes Andrea Cavallier