(NYT) – The heart devices do not track location, nor do they transmit across large distances.

Like an estimated three million Americans, Nancy Guthrie, the 84-year-old mother of the NBC News anchor Savannah Guthrie, has a pacemaker implanted in her chest.

Law enforcement officials who are investigating her kidnapping are reported to have contacted the company that made Ms. Guthrie’s device to find out what they can learn from the information it yields.

Experts in heart health and digital forensics say the answer may be “not much.” (Read More)