The rapidly expanding wearable device market raises serious privacy concerns, as some device makers collect a massive amount of personal data and share it with other companies, according to a new study.

Existing health privacy laws don’t generally apply to wearable makers, the study says. While consumers are embracing fitness trackers, smart watches, and smart clothing, a “weak and fragmented” health privacy regulatory system in the U.S. fails to give consumers the privacy protections they may expect, said the study, released Thursday by the Center for Digital Democracy and the School of Communication at American University.

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