Period tracking apps haven't been used for prosecution yet, because abortion has been legal. There are now trigger laws in effect in some US states where having an abortion is punished by life imprisonment.
The prosecutors in those states are no-doubt smacking their lips at the idea of using such data to find supporting evidence that a woman had a secret abortion.
The prosecutors in those states are no-doubt smacking their lips at the idea of using such data to find supporting evidence that a woman had a secret abortion.