(Bloomberg) -- St. Jude Medical Inc. is facing new allegations from short-seller Muddy Waters LLC that its pacemakers and defibrillators, life-saving devices used by thousands of people worldwide, can be easily hacked and turned against the patients relying on them.

Muddy Waters, which has already disclosed a short position in St. Jude that generates profit when the stock price falls, is intensifying its criticism of the medical technology company, which is in the middle of being acquired by Abbott Laboratories. The investment firm run by Carson Block released a technical video that walks viewers through the heart devices’ vulnerabilities and shows how they can be exploited by computer hackers, a step it previously declined to take.

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