With a growing influx of IoT sensors being deployed across society, police can access dozens of reliable trackers cooperating to keep tabs on both suspects and victims. Wearable IoT devices are the most intimate of all, continually logging the wearer’s physical or physiological activity.

A recent case involves a Connecticut man’s account of his wife’s murder by a home intruder. However, her Fitbit tracker showed her stepping around the house for almost an hour after her husband claimed she had been shot dead. District Attorney Craig Stedman said that

“It is an electronic footprint that tracks your movements. It is a great tool for investigators. We can also get the information much faster than some other types of evidence, such as DNA tests.”

In conjunction with data pulled from the family’s home alarm system and other devices, police were able to present a solid picture contradicting the husband’s story.

This isn’t the first time FitBit has contributed to a criminal case. District Attorney spokesperson Brett Hambright told Buzzfeed that

In 2015 a woman reported being raped by an intruder in Lancaster, Pennsylvania. She had told police she was sleeping and woke to find a man on top of her in bed. Her Fitbit records show that she had been awake and walking around the whole night.

Still, “To say it is rare to use Fitbit records would be safe,” DA Stedman told the Hartford Courant.